package jp.funnything.competition.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;

import org.apache.commons.io.IOUtils;

public class QuestionReader {
    private final BufferedReader _reader;

    public QuestionReader( final File input ) {
        try {
            _reader = new BufferedReader( new FileReader( input ) );
        } catch ( final FileNotFoundException e ) {
            throw new RuntimeException( e );
        }
    }

    public void close() {
        IOUtils.closeQuietly( _reader );
    }

    public String read() {
        try {
            return _reader.readLine();
        } catch ( final IOException e ) {
            throw new RuntimeException( e );
        }
    }

    public BigDecimal[] readBigDecimals() {
        return readBigDecimals( " " );
    }

    public BigDecimal[] readBigDecimals( final String separator ) {
        final String[] tokens = readTokens( separator );

        final BigDecimal[] values = new BigDecimal[ tokens.length ];
        for ( int index = 0 ; index < tokens.length ; index++ ) {
            values[ index ] = new BigDecimal( tokens[ index ] );
        }

        return values;
    }

    public BigInteger[] readBigInts() {
        return readBigInts( " " );
    }

    public BigInteger[] readBigInts( final String separator ) {
        final String[] tokens = readTokens( separator );

        final BigInteger[] values = new BigInteger[ tokens.length ];
        for ( int index = 0 ; index < tokens.length ; index++ ) {
            values[ index ] = new BigInteger( tokens[ index ] );
        }

        return values;
    }

    public int readInt() {
        final int[] values = readInts();

        if ( values.length != 1 ) {
            throw new IllegalStateException( "Try to read single interger, but the line contains zero or multiple values" );
        }

        return values[ 0 ];
    }

    public int[] readInts() {
        return readInts( " " );
    }

    public int[] readInts( final String separator ) {
        final String[] tokens = readTokens( separator );

        final int[] values = new int[ tokens.length ];
        for ( int index = 0 ; index < tokens.length ; index++ ) {
            values[ index ] = Integer.parseInt( tokens[ index ] );
        }

        return values;
    }

    public long readLong() {
        final long[] values = readLongs();

        if ( values.length != 1 ) {
            throw new IllegalStateException( "Try to read single interger, but the line contains zero or multiple values" );
        }

        return values[ 0 ];
    }

    public long[] readLongs() {
        return readLongs( " " );
    }

    public long[] readLongs( final String separator ) {
        final String[] tokens = readTokens( separator );

        final long[] values = new long[ tokens.length ];
        for ( int index = 0 ; index < tokens.length ; index++ ) {
            values[ index ] = Long.parseLong( tokens[ index ] );
        }

        return values;
    }

    public String[] readTokens() {
        return readTokens( " " );
    }

    public String[] readTokens( final String separator ) {
        return read().split( separator );
    }
}

import java.util.*;

public class Recycled {
    public static void main(String[] args) throws Exception {


        Scanner s = new Scanner(System.in);
        int T = Integer.parseInt(s.nextLine());
        for (int t = 0; t < T; t++) {
            int A = s.nextInt();
            int B = s.nextInt();
            long[] values = new long[B + 1];

            Set<Pair> set = new HashSet<Pair>();

            for (int i = A; i <= B; i++) {
                String istr = "" + i;
                for (int j = 1; j < istr.length(); j++) {
                    String prefix = istr.substring(istr.length() - j, istr.length());
                    String suffix = istr.substring(0, istr.length() - j);
//                    Set<Integer> set = new HashSet<Integer>();
                    if (prefix.charAt(0) != '0') {
                        String newNumber = prefix + suffix;
                        int newNumberInt = Integer.parseInt(newNumber);
//                        System.out.println(newNumberInt);
                        if (newNumberInt > i && newNumberInt <= B
                                && String.valueOf(i).length() == String.valueOf(newNumberInt).length()) {
//                            if (set.contains(newNumberInt))
//                                System.out.println(newNumberInt);
//                            set.add(newNumberInt);
                            values[newNumberInt] += 1;
                            Pair p = new Pair(i, newNumberInt);
                            set.add(p);
//                            System.out.println("(" + i + ", " + newNumberInt + ")");
                        }
                    }
                }
            }

            long sum = 0;
            for (int i = A; i <= B; i++) {
                sum += values[i];
            }
            System.out.println("Case #" + (t + 1) + ": " + set.size());
        }
    }
}

class Pair {

    int n;
    int m;

    public Pair(int n, int m) throws Exception {
        if (n >= m)
            throw new Exception();

        this.n = n;
        this.m = m;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Pair pair = (Pair) o;

        if (m != pair.m) return false;
        if (n != pair.n) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = n;
        result = 31 * result + m;
        return result;
    }
}