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.FileInputStream;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;

public class ProblemC
{
	public static void main(String[] args)
	{
		//try { System.setIn(new FileInputStream("C-small-attempt0.in")); } catch (Exception e) { }
		//try { System.setIn(new FileInputStream("C-large.in")); } catch (Exception e) { }
		//try { System.setOut(new PrintStream(new FileOutputStream("C-large-out.txt"))); } catch (Exception e) { }
		
		Scanner sc = new Scanner(System.in);
		int T = sc.nextInt();
		for (int t = 1; t <= T; t++)
		{
			int A = sc.nextInt(), B = sc.nextInt();
			int c = 0;
			int D = 1 + (int)Math.log10(A);
			int M = (int)Math.pow(10, D - 1);
			Set<Integer> set = new TreeSet<Integer>();
			for (int a = A; a < B; a++)
			{
				int aa = a;
				set.clear();
				for (int d = 1; d < D; d++)
				{
					aa = aa / 10 + M * (aa % 10);
					if (a < aa && aa <= B && !set.contains(aa))
					{
						c++;
						set.add(aa);
					}
				}
			}
			System.out.printf("Case #%d: %d\r\n", t, c);
		}
	}
}
/*
5
1 9
10 40
100 500
1111 2222
1000000 2000000
*/
