import java.util.Scanner;
import java.io.*;
import java.lang.Math;


public class C{
	public static int recycle(String str){
		String[] numbers = str.split(" ");
		int min = Integer.parseInt(numbers[0]);
		int max = Integer.parseInt(numbers[1]);
		int ret = 0;

		for(int i = min; i < max; i++){
			String num = i + "";
			int len = num.length();
			int k = i;
			for(int j = 1; j < len; j++){
				k = (k/10) + (int)java.lang.Math.pow(10.0,(double)(len-1))*(k%10);
				if (k > i && k <= max)
					ret++;
				else if(k == i)
					break;
			}
		}

		return ret;
	}

	public static void main(String[] args){
		Scanner sc = null;
		String next;
		int out;
		try{
			sc = new Scanner(new File("C-large.in"));
			int cases = Integer.parseInt(sc.nextLine());
			int current = 0;
			

			FileWriter fs = new FileWriter("output.txt");
			BufferedWriter buff = new BufferedWriter(fs);
			while(current < cases){
				next = sc.nextLine();
				current++;
				out = recycle(next);
				buff.write("Case #" + current + ": " + out + "\n");
			}
			buff.close();
		}
		catch(Exception ex){}
	}
}
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.HashSet;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class C {
	public static void main(String[] args) throws Exception {

		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		int n = Integer.parseInt(in.readLine());

		ExecutorService es = Executors.newFixedThreadPool(Math.min(8, n));
		@SuppressWarnings("unchecked")
		Future<Integer>[] fs = new Future[n];

		for (int i = 0; i < n; i++) {
			String[] parts = in.readLine().split(" ");
			final int A = Integer.parseInt(parts[0]);
			final int B = Integer.parseInt(parts[1]);

			fs[i] = es.submit(new Callable<Integer>() {
				public Integer call() {
					return wastetime(A, B);
				}
			});

		}
		for (int i = 0; i < n; i++) {
			System.out.println("Case #" + (i + 1) + ": " + fs[i].get());
		}
		es.shutdown();

	}

	public static int wastetime(int A, int B) {
		HashSet<Long> answers = new HashSet<Long>();
		int len = (int) Math.log10(A) + 1;
		int m;
		int div = (int) Math.pow(10, len - 1);
		if (div <= 0) {
			return 0;
		}

		for (int n = A; n < B; n++) {
			m = n;
			for (int i = 0; i < len; i++) {
				m = ((m % div) * 10) + m / div;
				if (m > n && m <= B) {
					long ans = ((n & 0xFFFFFFFFl) << 32) + m;
					//System.out.println(Long.toHexString(ans));
					answers.add(ans);
				}
			}
		}
		return answers.size();//

		// return div;
	}
}