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.*;

public class FileReader {
    
    FileInputStream in;
    DataInputStream dis;
    BufferedReader br;
    public FileReader(File input) throws FileNotFoundException
    {
        in = new FileInputStream(input);
        dis = new DataInputStream(in);
        br = new BufferedReader(new InputStreamReader(dis));
    }
    
    public String nextString() throws IOException
    {
        return br.readLine();
    }
    
    public String[] nextStringArray() throws IOException
    {
        return br.readLine().split(" ");
    }
        
    public char nextChar() throws IOException
    {
        return (char)br.read();
    }
    
    public char[] nextCharArray() throws IOException
    {
        return br.readLine().toCharArray();
    }
    
    public int nextInt() throws IOException
    {
        return Integer.parseInt(nextString());
    }
    
    public int[] nextIntArray() throws IOException
    {
        String[] split = nextStringArray();
        int[] result = new int[split.length];
        for (int i = 0; i < split.length; i++)
        {
            result[i] = Integer.parseInt(split[i]);
        }
        return result;
    }
    
    public long nextLong() throws IOException
    {
        return Long.parseLong(nextString());
    }
    
    public long[] nextLongArray() throws IOException
    {
        String[] split = nextStringArray();
        long[] result = new long[split.length];
        for (int i = 0; i < split.length; i++)
        {
            result[i] = Long.parseLong(split[i]);
        }
        return result;
    }
            
}
