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 recyclednumbers;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class SimpleReader {

	private BufferedReader br;
	private int line = 0;
	
	public SimpleReader() {
		String filename = prompt();
		setReader(filename);
	}
	
	public SimpleReader(String filename) {
		setReader(filename);
	}
	
	private String prompt() {
		System.out.println("Input file: ");
		BufferedReader bufr = new BufferedReader(
									new InputStreamReader(System.in));
		String filename = null;
		try {
			filename = bufr.readLine();
		} catch (IOException e) {
			System.err.println("At prompt: " + e.getMessage());
		}
		return filename;
	}
	
	private void setReader(String filename) {
		try {
			br = new BufferedReader(new FileReader(filename));
		} catch (IOException e) {
			System.err.println(e.getMessage());
		}
	}
	
	public String readLine() {
		try {
			line++;
			return br.readLine();
		} catch (IOException e) {
			System.err.println("Line " + (line - 1) + ": " + e.getMessage());
			return null;
		}
	}
	
	public int readInt() {
		return Integer.parseInt(readLine());
	}
	
	public int[] readIntArray() {
		String[] tokens = readLine().split(" ");
		int[] ret = new int[tokens.length];
		for (int i = 0; i < tokens.length; i++) {
			ret[i] = Integer.parseInt(tokens[i]);
		}
		return ret;
	}
	
	public String[] readStringArray() {
		return readLine().split(" ");
	}
}
