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.util.Scanner;


public class C {
	
	
	int A = 0;
	int B = 0;
	int cnt = 0;
	
	public int getDig(int x){
		int temp = x;
		int dig = 0;
		while(temp>0){
			dig++;
			temp/=10;		
		}
		return dig;
		
	}
	
	public int flip(int x, int time){
		int temp = x;
		int base = 1;
		for(int i = 1; i<=time;i++) base*=10; 
		int last = temp %base;
		
		
		for(int i = 1; i<=time; i++) temp/=10;		
		for(int i = 1; i<=getDig(x)-time; i++) last*=10;
		
		int ans = last + temp;	
		return ans;
	}
	
	public void getPair(int x){
		if (x<10) return;
		
		
		int dig = getDig(x);
		
		for (int i = 1; i<=dig-1;i++){
			int next = flip(x,i);
			if (dig!=getDig(A)) continue;
			if (next<x) continue;
			if (next==x) break;
			if (next>B||next<A) continue;
//			System.out.println(x+","+next);
			cnt++;
		}		
		return;
	}
	
	public C(Scanner input){
		int T = input.nextInt();
		for(int tt= 1; tt<=T;tt++){
			
			A =input.nextInt();
			B =input.nextInt();
				
			cnt = 0;

			for(int i = A; i<=B; i++){
				getPair(i);				
			}
			System.out.println("Case #"+tt+": "+cnt);
		}
		
	}
	
	public static void main(String args[]){
		new C(new Scanner(System.in));
	}
}
/*
4
1 9
10 40
100 500
1111 2222


*/