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

class B
{
	public static void main(String[] args) 
	{
		try
		{
			BufferedReader br = new BufferedReader(new FileReader("B.in"));
			PrintWriter pw = new PrintWriter(new FileWriter("B.out"));
			int X = Integer.parseInt(br.readLine());

			for(int i=0; i<X; i++)
			{
				String[] S = br.readLine().split(" ");
				int A = Integer.parseInt(S[0]);
				int B = Integer.parseInt(S[1]);
				int R = 0;

				int x = 1;
				int n = 0;
				while(A/x > 0) {
					n++;
					x *= 10;
				}

				for(int j=A; j<B; j++) {
					Set<Integer> seen = new HashSet<Integer>();
					for(int k=1; k<n; k++) {
						int p1 = j % (int)Math.pow(10, k);
						int p2 = (int) Math.pow(10, n-k);
						int p3 = j / (int)Math.pow(10, k);
						int y = p1*p2 + p3;
						
						if(j < y && !seen.contains(y) && y <= B) {
							seen.add(y);
							R++;
						}
					}
				}

				pw.printf("Case #%d: %d\n", i+1, R);
				pw.flush();
			}
		}
		catch(Exception e)
		{ 
			e.printStackTrace();
		}
	}
}


import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
/**
 *
 * @author Chung Lee
 */
public class RecycleNumber {
    
    public static void Main(String[] args) throws FileNotFoundException {

        Scanner scanner = new Scanner(new File(args[0]));
        
        PrintWriter writer = new PrintWriter(args[1]);

        int noCase = scanner.nextInt();

        for (int i = 0; i < noCase; i++) {
            int A = scanner.nextInt();
            int B = scanner.nextInt();

            int noRecyclePair = 0;
            for (int j = A; j <= B; j++) {
                noRecyclePair += getNoRecyclePair(j, A, B);
            }

            noRecyclePair /= 2;

            System.out.print(String.format("Case #%d: %d", i + 1, noRecyclePair));
            writer.print(String.format("Case #%d: %d", i + 1, noRecyclePair));

            if (i != noCase - 1) {
                System.out.println();
                writer.println();
            }
        }
        writer.close();
    }

    public static int getNoRecyclePair(int num, int A, int B) {
        int temp = num;
        int digits = 0;
        while (temp != 0) {
            temp /= 10;
            digits++;
        }

        int noRecyclePair = 0;
        
        
        for (int i = 1; i <= digits; i++) {
            int recycleNum = (int) ((num % Math.pow(10, i)) * Math.pow(10, digits - i)
                    + (num / Math.pow(10, i)));
            if (recycleNum != num
                    && recycleNum >= A
                    && recycleNum <= B) {
                noRecyclePair++;
                    
            }
        }

        return noRecyclePair;

    }
}
