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 Main{
	static int power(int d)
	{
		if(d== 0) return 1;
		else if(d%2 == 0) 
		{
			int a = power(d/2);
			return a*a;
		}
		else
		{
			int a = power(d/2);
			return a*a*10;
		}
	}
	public static void main(String [] args)
	{
		Scanner in = new Scanner(System.in);
		int T = in.nextInt();
		for(int cc = 1; cc<= T; cc++)
		{
			int A = in.nextInt();
			int B = in.nextInt();
			int Digit = Integer.toString(A).length();
			int tab[] = new int[3000];
			for(int i = 0; i<3000; i++)
			{
				tab[i] = -1;
			}
			for(int i = A; i<B; i++)
			{
				if(tab[i] == -1)
				{
					tab[i] = 1;
					int current = i;
					for(int j = 0; j<Digit-1; j++)
					{
						int a = current%10;
						int b = current/10;
						int next = a*power(Digit-1)+b;
						//System.out.println(next);
						if(next >= A && next <=B)
						{
							if(tab[next] == -1)
							{
								tab[next] =0;
								tab[i] ++;
							}
						}
						current = next;
					}
				}
			}
			int res = 0;
			for(int i = A; i<B; i++)
			{
				res += tab[i]*(tab[i]-1)/2;
			}
			System.out.println("Case #"+cc+": "+res);
		}
	}
}