/*
 * 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 dancing
{
	public static void main(String[] args)throws Exception
	{
		BufferedReader br = new BufferedReader(new FileReader("dancing.in"));
		PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter("dancing.out")));
		
		int n = Integer.parseInt(br.readLine());
		
		for(int i = 0; i < n; i++)
		{
			StringTokenizer st = new StringTokenizer(br.readLine() + " ");
			int a = Integer.parseInt(st.nextToken());
			int b = Integer.parseInt(st.nextToken());
			int count = 0;
			for(int k = a; k <= b; k++)
			{
				if(k == 1000) continue;
				if(k / 10 == 0) continue;
				if(k / 100 == 0)
				{
					String s = "" + (k % 10) + "" + (k / 10);
					int si = Integer.parseInt(s);
					if(si < k && si >= a) count++;
					continue;
				}
				if(k / 1000 == 0)
				{
					String s1 = "" + (k%100) + "" + (k/100);
					int i1 = Integer.parseInt(s1);
					if(i1 >= a && i1 < k) count++;
					
					String s2 = "" + (k%10) + "" + (k/10);
					int i2 = Integer.parseInt(s2);
					if(i2 < k && i2 >= a) count++;
				}
				
			}
			pw.println("Case #" + (i+1) + ": " + count);
		}
		pw.close();
		System.exit(0);
		
	}
}
