import java.io.*;
import java.util.*;

class B
{
	public static void main(String[] args) 
	{
		try
		{
			BufferedReader br = new BufferedReader(new FileReader("B.in"));
			PrintWriter pw = new PrintWriter(new FileWriter("B.out"));
			int X = Integer.parseInt(br.readLine());

			for(int i=0; i<X; i++)
			{
				String[] S = br.readLine().split(" ");
				int A = Integer.parseInt(S[0]);
				int B = Integer.parseInt(S[1]);
				int R = 0;

				int x = 1;
				int n = 0;
				while(A/x > 0) {
					n++;
					x *= 10;
				}

				for(int j=A; j<B; j++) {
					Set<Integer> seen = new HashSet<Integer>();
					for(int k=1; k<n; k++) {
						int p1 = j % (int)Math.pow(10, k);
						int p2 = (int) Math.pow(10, n-k);
						int p3 = j / (int)Math.pow(10, k);
						int y = p1*p2 + p3;
						
						if(j < y && !seen.contains(y) && y <= B) {
							seen.add(y);
							R++;
						}
					}
				}

				pw.printf("Case #%d: %d\n", i+1, R);
				pw.flush();
			}
		}
		catch(Exception e)
		{ 
			e.printStackTrace();
		}
	}
}

import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Scanner;

public class C {
	static long[] ten;

	public static void main(String[] args) throws IOException {
		initializeTens();

		Scanner in = new Scanner(new FileReader("input.in"));
		BufferedWriter bw = new BufferedWriter(new FileWriter("output"));

		int T = in.nextInt(), start, end;
		for (int i = 1; i <= T; i++) {
			start = in.nextInt(); end = in.nextInt();
			int ans = cntPairs(start, end);
			bw.write("Case #" + i + ": " + ans);
			bw.newLine();
		}

		bw.close();
		System.out.println("end");
	}

	private static int cntPairs(int start, int end) {
		boolean[] v = new boolean[end+1];
		
		int cnt = 0;
		for(int i = start; i <= end; i++)
			if(!v[i])
				cnt += getPairs(i, start, end, v);
		
		return cnt;
	}

	private static int getPairs(int n, int start, int end, boolean[] v) {
		HashSet<Integer> set = new HashSet<Integer>();
		
		int len = getLength(n), cnt = 0;
		v[n] = true;
		
		for (int i = 1; i < len; i++) {
			long num = n * ten[i];
			num = num + n / ten[len - i];
			num = num % ten[len];

			int res = (int) num;
			if (res >= start && res <= end && len == getLength(res) && !v[res] && !set.contains(res)){
				set.add(res);
				cnt++;
			}
		}
		return cnt;
	}

	public static int getLength(int n) {
		return (int) (Math.log10(n) + 1e-6) + 1;
	}

	private static void initializeTens() {
		ten = new long[8];
		ten[1] = 10;
		for (int i = 2; i < ten.length; i++)
			ten[i] = 10 * ten[i - 1];
	}
}

/*
Case #1: 2498449

 *
 */

/*
Case #1: 615
Case #2: 0
Case #3: 680
Case #4: 732
Case #5: 622
Case #6: 536
Case #7: 0
Case #8: 721
Case #9: 719
Case #10: 0
Case #11: 730
Case #12: 560
Case #13: 590
Case #14: 742
Case #15: 596
Case #16: 738
Case #17: 604
Case #18: 662
Case #19: 670
Case #20: 6
Case #21: 614
Case #22: 640
Case #23: 684
Case #24: 757
Case #25: 608
Case #26: 697
Case #27: 780
Case #28: 646
Case #29: 776
Case #30: 199
Case #31: 624
Case #32: 602
Case #33: 748
Case #34: 728
Case #35: 6
Case #36: 628
Case #37: 718
Case #38: 634
Case #39: 674
Case #40: 609
Case #41: 0
Case #42: 695
Case #43: 637
Case #44: 0
Case #45: 744
Case #46: 1
Case #47: 36
Case #48: 801
Case #49: 192
Case #50: 724
*/