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.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.util.ArrayList;


public class main {

	/**
	 * @param args
	 * @throws Exception 
	 */

	public static int[] flag;
	public static ArrayList[] array;
	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		Input in = new Input("small.txt");
		
		File file = new File("out.txt");
		FileWriter filewriter = new FileWriter(file);
		BufferedWriter bw = new BufferedWriter(filewriter);
		PrintWriter pw = new PrintWriter(bw);
		
		int n = in.getInt();
		
		for(int i = 0; i < n ; i ++){
			int result = 0;
			int num = i + 1 ;
			int a = in.getInt();
			int b = in.getInt();	
			int d = Integer.toString(a).length();
			array = new ArrayList[b+1];
			for(int j = a ; j <= b; j++){
				array[j] = new ArrayList();
			}
			for(int j = a ; j <=b ; j++){
				String s = Integer.toString(j) + Integer.toString(j);
				result += solve(s,d,a,b,j);				
			}
			
			String ans = "Case #" +num +": "+result; 
			pw.println(ans);
			System.out.println(ans);
		}
		pw.close();
		bw.close();
		filewriter.close();
	}
	
	public static int solve(String s , int d,int a , int b,int j){
		int result = 0;
		int original = j;
		
		for(int i = 0 ; i < d ; i++){
			String sub = s.substring(i+1, i+1+d);
			int subint = Integer.parseInt(sub);
			
			if(subint >= a && subint <=b && subint !=original){
				if(subint<original){
					int flag = 0;
					for(int k  = 0 ; k < array[subint].size(); k++){
						if(Integer.parseInt(array[subint].get(k).toString())==original){
							flag++;
							break;
						}
					}
					if(flag ==0){
						array[subint].add(original);
						result++;
					}
				}else{
					int flag = 0;
					for(int k  = 0 ; k < array[original].size(); k++){
						if(Integer.parseInt(array[original].get(k).toString())==subint){
							flag++;
							break;
						}
					}
					if(flag ==0){
						array[original].add(subint);
						result++;
					}
				}
			}
			
		}
		return result;
	}

}
