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.util.ArrayList;
import java.util.HashMap;
import java.util.Scanner;

public class CodeJamC
{
	public static void main(String args[]) throws Exception
	{
		Scanner in = new Scanner(new File("in.txt"));
		BufferedWriter out = new BufferedWriter(new FileWriter("out.txt"));
		int cases = in.nextInt();
		for(int casenum = 1;casenum <= cases;casenum++)
		{
			int a = in.nextInt();
			int b = in.nextInt();
			int count = 0;
			HashMap<Integer,ArrayList<Integer>> map = new HashMap<Integer,ArrayList<Integer>>();
			
			int len = ("" + a).length();

			for(int n = a;n <= b;n++)
			{
				int t = n;
				for(int i = 0;i<len-1;i++)
				{
					t = (t%10)*(int)(Math.pow(10,len-1)) + t/10;
					if(t > n && t <= b)
					{
						if(map.containsKey(n))
						{
							if(!map.get(n).contains(t))
							{
								count++;
								map.get(n).add(t);
							}
						}
						else
						{
							ArrayList<Integer> arr = new ArrayList<Integer>();
							arr.add(t);
							map.put(n,arr);
							count++;
						}
					}
				}
			}

			out.write("Case #" + casenum + ": " + count + "\n");
		}
		in.close();
		out.close();
	}
}