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

class B
{
	public static void main(String[] args) 
	{
		try
		{
			BufferedReader br = new BufferedReader(new FileReader("B.in"));
			PrintWriter pw = new PrintWriter(new FileWriter("B.out"));
			int X = Integer.parseInt(br.readLine());

			for(int i=0; i<X; i++)
			{
				String[] S = br.readLine().split(" ");
				int A = Integer.parseInt(S[0]);
				int B = Integer.parseInt(S[1]);
				int R = 0;

				int x = 1;
				int n = 0;
				while(A/x > 0) {
					n++;
					x *= 10;
				}

				for(int j=A; j<B; j++) {
					Set<Integer> seen = new HashSet<Integer>();
					for(int k=1; k<n; k++) {
						int p1 = j % (int)Math.pow(10, k);
						int p2 = (int) Math.pow(10, n-k);
						int p3 = j / (int)Math.pow(10, k);
						int y = p1*p2 + p3;
						
						if(j < y && !seen.contains(y) && y <= B) {
							seen.add(y);
							R++;
						}
					}
				}

				pw.printf("Case #%d: %d\n", i+1, R);
				pw.flush();
			}
		}
		catch(Exception e)
		{ 
			e.printStackTrace();
		}
	}
}

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.util.Arrays;
import java.util.Scanner;

public class Read {
	int noOfTestCases;
	
	
int []nums;
	public void test() throws FileNotFoundException{
		File file = new File("out");
		File file2 = new File("out2");
		Scanner scanner = new Scanner(file);
		Scanner scanner2 = new Scanner(file2);
		while(scanner.hasNext()){
			String l1 = scanner.nextLine();
			String l2 = scanner2.nextLine();
			if(!l2.equals(l1)){
				System.out.println(l1);
				System.out.println(l2);
				System.out.println("wrong");
			}
		}
	}

	public void Read(String name) {
		File file = new File(name);

		try {

			Scanner scanner = new Scanner(file);
			String line = scanner.nextLine();
			noOfTestCases = Integer.parseInt(line);
			nums =  new int[noOfTestCases*2];
			int i=0;
			while(i<noOfTestCases){
			line = scanner.nextLine();
			line=line.replaceAll("  ", "");
			String []numS = line.split(" ");
			nums[2*i]=Integer.parseInt(numS[0]);
			nums[2*i+1]=Integer.parseInt(numS[1]);
			i++;
			}
		} catch (FileNotFoundException e) {

		}

	}
	public void write(String fname,String data)
	{
		try{
			  // Create file 
			  FileWriter fstream = new FileWriter(fname);
			  BufferedWriter out = new BufferedWriter(fstream);
			  out.write(data);
			  //Close the output stream
			  out.close();
			  }catch (Exception e){//Catch exception if any
			  System.err.println("Error: " + e.getMessage());
			  }
	}
public static void main(String[] args) throws FileNotFoundException {
	Read r = new Read();
	r.test();
//	for (int i = 0; i < 50; i++) {
//		System.out.println("1000000 2000000");
//	}
}
}
