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.HashSet;
import java.util.Scanner;

public class recycled {
	public static void main(String[] args){
		int t;
		Scanner s = new Scanner(System.in);
		t=s.nextInt();
		for(int k=1;k<=t;k++){
			int a,b;
			a=s.nextInt();
			b=s.nextInt();
			int al=a/10,d=1;
			while(al>0){
				d++;
				al/=10;
			}
			int count=0;
			for(int i=a;i<=b;i++){
				HashSet<Integer> hs = new HashSet<Integer>();
				for(int j=1;j<d;j++){
					int p=(int) (Math.pow(10,j));
					int l=i/p;
					int r=i%p;
					int n=r*((int) (Math.pow(10,d-j))) + l ;
					if(n>=a && n<=b && n!=i) {
						if(!hs.contains(n)){
							count++;
							hs.add(n);
						}
					}
				}
			}
			System.out.println("Case #"+k+": "+(count/2));
		}
	}
}
