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

import java.util.HashSet;

/**
 *
 * @author vandit
 */
public class RecycleNumbers {

    private HashSet<String> numbers = new HashSet<String>();
    private HashSet<String> initialTempNumbers = new HashSet<String>();
    private HashSet<String> finalTempNumbers = new HashSet<String>();

    HashSet<Pair> numberPairs = new HashSet<Pair>();


    private void findRecycledNumbers(int start, int end, int places) {


        for (int i = start; i <= end; i++) {
            String initialNumber = Integer.toString(i);
            //if (!(numbers.contains(initialNumber) || finalTempNumbers.contains(initialNumber))) {

                StringBuffer tempNumber = new StringBuffer(initialNumber);
                int len = tempNumber.length();
                int startIndexToMove = len - places;
                String tempString = tempNumber.substring(startIndexToMove);
                if ((places == 1 && tempString.equals("0")) || tempString.charAt(0) == '0') {
                    continue;
                }
                tempNumber.delete(startIndexToMove, len);
                String finalTempNumber = tempString + tempNumber.toString();

                if (! (finalTempNumber.equals(initialNumber) || Integer.parseInt(finalTempNumber) > end || Integer.parseInt(finalTempNumber) < Integer.parseInt(initialNumber))) {
                    numbers.add(initialNumber);
                    finalTempNumbers.add(finalTempNumber);
                    Pair pair = new Pair(finalTempNumber,initialNumber);
                    numberPairs.add(pair);
                }
            }

        

    }

    public HashSet<Pair> findAllRecycledNumbers(int start, int end) {
        int length = Integer.toString(start).length();
        for (int i = 1; i < length; i++) {
            findRecycledNumbers(start, end, i);
        }
        return numberPairs;
    }
}

import java.io.*;
import java.util.*;

public class C {
	
	public static BufferedReader in;
	public static StringTokenizer st;

	public static void main(String[] args) throws IOException{
		in = new BufferedReader(new FileReader("C.in"));
		PrintWriter out = new PrintWriter(new FileWriter("C.out"));
		
		int test = readInt();
		for (int t=1; t<=test; t++){
			out.print("Case #"+t+": ");
			
			int start = readInt(), end = readInt();
			
			int counter=0;
			for (int i=start; i<=end; i++){
				counter += test(i, start, end);
			}
			out.println(counter);
		}
		
		in.close();
		out.close();
	}
	
	public static String readLine() throws IOException{
		return in.readLine();
	}
	
	public static String readToken() throws IOException{
		if (st==null || !st.hasMoreTokens())
			st = new StringTokenizer(readLine());
		
		return st.nextToken();
	}
	
	public static int readInt() throws IOException{
		return Integer.parseInt(readToken());
	}
	
	public static int test(int i, int start, int end){
		int curr = i;
		int ret =0;
		int numDigits = String.valueOf(i).length();
		int mult = (int)Math.pow(10, numDigits-1);
		do{
			int last = curr%10;
			curr = curr/10 + last*mult;
			System.out.println(i+" "+curr);
			if (curr>i && curr<=end) ret++;
		}while(curr!=i);
		return ret;
	}
}
