import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashSet;

public class Recycled {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            int t = Integer.parseInt(br.readLine());
            for (int i = 0; i < t; i++) {
                String[] str = br.readLine().split(" ");
                int a = Integer.parseInt(str[0]);
                int b = Integer.parseInt(str[1]);
                System.out.println("Case #" + (i + 1) + ": " + find(a, b));
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static int find(int a, int b) {
        HashSet<Long> used = new HashSet<Long>();
        int digits = String.valueOf(a).length();
        if (digits == 1) return 0;
        for (int i = a; i <= b; i++) {
            int s = 10;
            int m = (int) Math.pow(10, digits-1);
            for (int j = 0; j < digits-1; j++) {
                int r = i % s;
                if (r < s/10) continue;
                int q = i / s;
                int rn = r * m + q;
                s *= 10; m /= 10;
                if (i != rn && rn >= a && rn <= b) {
                    long pp;
                    if (rn < i) pp = (long)rn << 30 | i;
                    else pp = (long)i << 30 | rn;
                    if (!used.contains(pp)) {
                        used.add(pp);
                    }
                }
            }
        }
        return used.size();
    }
}

import java.util.*;
import java.io.*;

public class C{
	
	public static void main(String[] args) throws IOException{
		Scanner inp = new Scanner(new File("C-large.in"));
		PrintWriter pw = new PrintWriter(new FileWriter("c-large.out"));
		
		int numCases = inp.nextInt();
		
		for (int cas = 0; cas < numCases; cas++){
			pw.print("Case #" + (cas+1) + ": ");
			
			/* case input */
			int A = inp.nextInt();
			int B = inp.nextInt();
			/* end case input */
			
			int ABak = A;
			int numDigits = 0;
			while (ABak > 0){
				ABak /= 10;
				numDigits++;
			}
			
			int ans = 0;
			
			/* main logic */
			for (int i = A; i < B; i++){
				
				Set<Integer> validMs = new HashSet<Integer>();
				for (int j = 1; j < numDigits; j++){
					int b = shift(i, j, numDigits);
					
					if (b <= B && b > i){
						validMs.add(new Integer(b));
					}
				}
				ans += validMs.size(); 
			}
			pw.println(ans);
		}
		pw.close();
	}
	
	public static int shift(int x, int k, int l){
		//int d = (int) Math.pow(10, k);
		int d = 1;
		for (int p = 1; p <= k; p++){
			d *= 10;
		}
		int tmp = x % d;
		int d2 = 1;
		for (int p = 1; p <= (l - k); p++){
			d2 *= 10;
		}
		tmp *= d2;
		return ((x/d) + tmp);
	}
}
