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();
		}
	}
}

package jp.ne.sakura.yuki2006.CodeJam;

import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class CodeJam {
	private FileWriter file;
	static int caseNumber = 0;
	private Scanner stdIn;

	private void write(String data) {
		caseNumber++;

		try {
			file.append("Case #");
			file.append(String.valueOf(caseNumber));
			file.append(": ");
			file.append(data);
			file.append("\n");
			file.flush();

		} catch (IOException e) {
			// TODO èªåçæããã catch ãã­ãã¯
			e.printStackTrace();
		}

	}

	public CodeJam(ITestCase test, String fileName) {
		try {
			file = new FileWriter(fileName);
		} catch (IOException e) {
			e.printStackTrace();
		}
		stdIn = new Scanner(System.in);
		stdIn.nextLine();
		while (stdIn.hasNext()) {

			write(test.testCase(stdIn));
		}
	}

}
