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

public class EasyNumbers { 
	public static void main(String[] args) throws Exception{
		PrintWriter out =new PrintWriter(new File("../easyNumbers/src/numberrr.out"));
		Scanner s =new Scanner(new File("../easyNumbers/src/number.in"));
		int ans,div,d,k,n1,n2,j,a,a1,b;
		int i,t;
		t = s.nextInt();
		for(int w = 1; w<=t; w++){
			a = s.nextInt();
			b = s.nextInt();
			ans=0;
			i=0;
			a1 = a;
			while(a1!=0){
				a1/=10;
				i++;
			}
			for(j=a;j<=b;j++){
				n2=j;
				for(k=0;k<i-1;k++){
					n1 = j;
					div = 1;
					while(n1 > 9){
						n1 = n1 / 10;
						div = div * 10;
					}
					d = n2 % 10;
					n2 = n2 / 10;
					n2 = n2 + d * div ;
					if(n2<=b && n2>=a && n2!=j && j<n2)
						ans++;                           
					if(n2==j)
						break;
				}
			}
		System.out.println("Case #"+ w +  ": " +ans);
		}
	}
}