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.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.InputStreamReader;


public class App {
	public static void main (String[] args){
		
		try{
			FileInputStream fstream = new FileInputStream("input.in");
			DataInputStream in = new DataInputStream(fstream);
			BufferedReader br = new BufferedReader(new InputStreamReader(in));
		
			int cases = Integer.parseInt(br.readLine());
			String output = "";
			
			for(int i=1;i<=cases;i++){
				String line = br.readLine();
				String[] arr = line.split(" ");
				
				int a = Integer.parseInt(arr[0]);
				int b = Integer.parseInt(arr[1]);
				
				int count = RecyclePair.Calculate(a, b);
				
				output += "Case #"+i+": "+count;
				
				if(i+1 <= cases){
					output += "\n";
				}
			}
			
			in.close();
			System.out.println(output);
			
			FileWriter fwstream = new FileWriter("output.out");
			BufferedWriter out = new BufferedWriter(fwstream);
			out.write(output);
			out.close();
		}
		catch (Exception e) {
			
		}
		
	}
}
