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

public class TemplateClass {

	protected Scanner sc;
	protected BufferedWriter bw;
	protected int testCases = 0;
	File ficheroEntrada;
	File ficheroSalida;

	public TemplateClass() {

	}

	public TemplateClass(String nombreFicheroEntrada, String nombreFicheroSalida)
			throws Exception {
		
		ficheroEntrada = new File (nombreFicheroEntrada);
		ficheroSalida = new File (nombreFicheroSalida);
		sc = new Scanner(ficheroEntrada);
		testCases = sc.nextInt();
		bw = traeBufferSalida(ficheroSalida);
	}

	protected BufferedWriter traeBufferSalida(File ficheroSalida)
			throws Exception {
		return new BufferedWriter(new FileWriter(ficheroSalida));

	}
	
	protected void procesaTestCase() throws Exception{
		
	}

}
