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.PrintWriter;
import java.util.HashSet;
import java.util.Scanner;

public class Solution {
	Solution() throws Exception {
	}

	String solve() throws Exception {
		int min = in.nextInt();
		int max = in.nextInt();

		return "" + permutations(min, max);
	}

	private int permutations(int min, int max) {
		int digits = Integer.toString(min).length();
		int permutations = 0;
		for (int i = min; i <= max; i++) {
			HashSet<Integer> found = new HashSet<>();
			for (int j = 1; j < digits; j ++) {
				int permutation = permute(i, j, digits);
				if (permutation > i && permutation <= max && permutation >= min) {
					found.add(permutation);
				}
			}
			permutations += found.size();
		}
		return permutations;
	}

	private int permute(int number, int permutation, int digits) {
		int m = (int) Math.pow(10, permutation);
		int back = number % m;
		int front = number / m;
		int m2 = (int) Math.pow(10, digits - permutation);
		return back * m2 + front;
	}

	void solveAll() throws Exception {
		int cases = in.nextInt();
		in.nextLine();
		for (int i = 1; i <= cases; i++) {
			String solution = "Case #" + i + ": " + solve();
			System.out.println(solution);
			out.println(solution);
		}
		out.flush();
	}

	// -----------------------------------------------------------------------

	static Scanner in = new Scanner(System.in);
	static PrintWriter out = new PrintWriter(System.out);

	public static void main(String[] args) throws Exception {
		new Solution().solveAll();
	}
}
