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_numbers {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		
		int T = scanner.nextInt();
		int[] answers = new int[T];
		
		for (int c = 0; c < T; c++) {
			int A = scanner.nextInt();
			int B = scanner.nextInt();
			
			int numdigits;
			for (numdigits = 1; A-Math.pow(10,numdigits) >= 0; numdigits++);			
			
			HashSet<Integer> done = new HashSet<Integer>();
			
			int n = A;
			int possiblem;
			answers[c] = 0;
			while (n <= B) {
				possiblem = n;
				int possiblemsthisround = 0;
				for (int i = 0; i <= numdigits; i++) {
					if ((possiblem%10) != 0) {
						possiblem = (possiblem%10)*((int)Math.pow(10,numdigits-1)) + (possiblem-(possiblem%10))/10;
						if ((possiblem <= B) && (possiblem > n)) {
							if (done.contains(possiblem) == false) {
								done.add(possiblem);
								possiblemsthisround++;
							}
							done.add(possiblem);
						}
					}
					else possiblem = (possiblem%10)*((int)Math.pow(10,numdigits-1)) + (possiblem-(possiblem%10))/10;
				}
				if (possiblemsthisround > 0) answers[c] += possiblemsthisround*(possiblemsthisround + 1)/2;
				n++;
			}
		}
		for (int i = 0; i < T; i++) {
			int j = i+1; 
			System.out.println("Case #"+j+": "+answers[i]);
		}
	
	}
}
