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.*;
import java.io.*;
import java.lang.Integer;


public class QuestionC
{

    public static void main(String[] args) throws IOException
    {

        Scanner inPut = new Scanner(new File("C-small-attempt0.in"));
        FileWriter fWriter = new FileWriter("C-small-attempt0.out");
        int caseTotal = inPut.nextInt();
        inPut.nextLine();
        for (int caseNum = 1; caseNum <= caseTotal; caseNum++)
        {

            // read the string length for this case
            int base = 1;
            int smallNum = inPut.nextInt();
            int largeNum = inPut.nextInt();
            int digit = 0;
            int temp = smallNum;
            while(temp != 0)
            {
                temp = temp/10;
                digit++;
            }
            int[] num = new int[digit];
            int total = 0;

            for (int i = 1; i < digit; i++)
            {
                base = base * 10;
            }
            fWriter.write("Case #" + caseNum + ": ");
            for(int i = largeNum; i >= smallNum; i--)
            {
                num[0] = i;

                for (int j = 1; j < digit; j++)
                {
                    boolean norepeat = false;
                    num[j] = num[j - 1] / base + (num[j - 1] % base) * 10;

                    if (num[j] >= smallNum && num[j] <= largeNum)
                    {
                        norepeat = true;
                        for (int k = j - 1; k >= 0; k--)
                        {
                            norepeat = norepeat && (num[j] != num[k]);
                        }
                    }
                    if(norepeat) total++;
                }
            }
            total = total / 2;
            fWriter.write(total + "\n");
        }
        fWriter.flush();
        fWriter.close();
    }
}
