package qual;

import java.util.Scanner;

public class RecycledNumbers {

	public static void main(String[] args) {
		new RecycledNumbers().run();

	}

	private void run() {
		Scanner sc = new Scanner(System.in);
		int T = sc.nextInt();
		for (int t = 0; t < T; t++) {
			int A = sc.nextInt();
			int B = sc.nextInt();
			int result = solve(A, B);
			System.out.printf("Case #%d: %d\n", t + 1, result);
		}
	}

	public int solve(int A, int B) {
		int result = 0;
		for (int i = A; i <= B; i++) {
			int dig = (int) Math.log10(A/*same as B*/) + 1;
			int aa = i;
			for (int d = 0; d < dig - 1; d++) {
				aa = (aa % 10) * (int)Math.pow(10, dig - 1) + (aa / 10);
				if (i == aa) {
					break;
				}
				if (i < aa && aa <= B) {
//					System.out.printf("(%d, %d) ", i, aa);
					result++;
				}
			}
		}
		return result;
	}

}

import java.io.*;
import java.util.*;
 
public class test {

    public static void main(String[] args) throws IOException {
 
        // Location of file to read

	functions aa = new functions();
        File file = new File("input.txt");
	Writer output = new BufferedWriter(new FileWriter("output.txt"));
	int i = 1;
	int answer = 0;
	String A = "";
	String B = "";
	int j = 0;
	int n = 0;
	
        try {
 
            Scanner scanner = new Scanner(file);
 	    n = Integer.parseInt((String)scanner.nextLine());
 	    
            while (scanner.hasNextLine()) {
            	A = "";
            	B = "";
                String line = scanner.nextLine();
                while(line.charAt(j) != ' '){
			A = A + line.charAt(j);
			j++;
                }
                j++;
                while(j < line.length()){
			B = B + line.charAt(j);
			j++;
                }
		j = 0;
                answer = aa.solve(A,B);
			if(i < n)
				output.write("Case #" + i +": "+ answer +"\n");
			else
				output.write("Case #" + i +": "+ answer);
		i++;
		
            }
            scanner.close();
            output.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
       }
      }
