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

public class Q {
	private static long solve(int from, int to) {
		int[] flag = new int[2000001];
		long res = 0;
		int t=from/10, b = 1; 
		while (t>0) {
			b*=10;t/=10;
		}
		for (int i = from; i < to; ++i) {
			t = i;			
			do {
				t = (t /10) + (t%10 * b);
				if (t > i && t<= to && flag[t] != i + 1) {
					flag[t] = i + 1;
					++res;
				}				
			} while (t != i);			
		}
		return res;
	}
	
	public static void main(String[] args) throws Exception {
		Scanner in = new Scanner(new File("input.txt"));
		PrintStream out = new PrintStream("output.txt");
		
		int num = in.nextInt();
		in.nextLine();
		for (int i=0;i<num;++i) {
			int from = in.nextInt();
			int to = in.nextInt();			
			StringBuilder builder = new StringBuilder("Case #" +(i+1)+": ");
			builder.append(solve(from, to));
			System.out.println(builder.toString());
			out.println(builder.toString());
		}
		
		in.close();
		out.close();
	}	
}
