import java.util.Scanner;
import java.io.*;
import java.lang.Math;


public class C{
	public static int recycle(String str){
		String[] numbers = str.split(" ");
		int min = Integer.parseInt(numbers[0]);
		int max = Integer.parseInt(numbers[1]);
		int ret = 0;

		for(int i = min; i < max; i++){
			String num = i + "";
			int len = num.length();
			int k = i;
			for(int j = 1; j < len; j++){
				k = (k/10) + (int)java.lang.Math.pow(10.0,(double)(len-1))*(k%10);
				if (k > i && k <= max)
					ret++;
				else if(k == i)
					break;
			}
		}

		return ret;
	}

	public static void main(String[] args){
		Scanner sc = null;
		String next;
		int out;
		try{
			sc = new Scanner(new File("C-large.in"));
			int cases = Integer.parseInt(sc.nextLine());
			int current = 0;
			

			FileWriter fs = new FileWriter("output.txt");
			BufferedWriter buff = new BufferedWriter(fs);
			while(current < cases){
				next = sc.nextLine();
				current++;
				out = recycle(next);
				buff.write("Case #" + current + ": " + out + "\n");
			}
			buff.close();
		}
		catch(Exception ex){}
	}
}
import java.io.*;
import java.util.*;

public class problemC{
	
	public static void main(String args[]) {
		try{
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			
			int T = Integer.valueOf(br.readLine());
			int count, a, b, base;
			String line;
			String[] lineSplit;
			for(int i = 0; i < T; i++){
				line = br.readLine();
				lineSplit = line.split(" ");
				count = 0;
				a = Integer.valueOf(lineSplit[0]);
				b = Integer.valueOf(lineSplit[1]);
				base = base(a);
				for(int j = a; j < b; j++){
					count += switchAround(j, b, base);
				}
				System.out.println("Case #" + (i+1) + ": " + count);
			}
			
		} catch(Exception e){
			
		}
	}		int div = 10;

	
	public static int switchAround(int num, int max, int base){
		int copy = num;
		int count = 0;
		ArrayList<Integer> listN = new ArrayList<Integer>();
		for(int i = 1; i < base; i *= 10) {
			if(num % 10 == 0) {
				num = num/10;
				continue;
			}
			num = num/10 + (num % 10) * base;
			if(num <= max && num > copy && !listN.contains(num)) {
				count++;
				listN.add(num);
			}
		}
		return count;
	}
	
	public static int base(int num){
		int base = 1;
		while(num/base != 0){
			base *= 10;
		}
		
		return base/10;
	}
}