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 );
    }
}

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
//package javaapplication1;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
import java.util.Arrays;

/**
 *
 * @author kent.wangsawan
 */
public class soal2 {
    public static void main(String [] args) throws IOException{
        BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer tok;
        int tc = Integer.parseInt(input.readLine());
        for(int i = 0; i<tc; i++){
            tok = new StringTokenizer(input.readLine());
            int awal = Integer.parseInt(tok.nextToken());
            int akir = Integer.parseInt(tok.nextToken());
            int count = 0;
            for(int j = awal; j<akir; j++){
                int temp = j;
                if(temp<10) continue;
                else if(temp< 100){
                    int a = temp%10;
                    temp = temp/10;
                    temp += a*10;
                    if(temp >= awal && temp <= akir && temp > j) {
                        count++;
                    }
                }
                else if(temp<1000){
                    for(int k = 0; k<2; k++){
                        int a = temp%10;
                        temp = temp/10;
                        temp += a*100;
                        if(temp >= awal && temp <= akir && temp > j) {
                            count++;
                        }
                        else if (temp == j)
                            break;
                    }
                }
                else if(temp < 10000){
                    for(int k = 0; k<3; k++){
                        int a = temp%10;
                        temp = temp/10;
                        temp += a*1000;
                        if(temp >= awal && temp <= akir && temp > j) {
                            count++;
                        }
                        else if (temp == j)
                            break;
                    }
                }
            }
            System.out.println("Case #"+(i+1)+": "+count);
        }
    }
}
