Problem:
Score : 100 points

Problem Statement

We have a sandglass that runs for X seconds. The sand drops from the upper bulb at a rate of 1 gram per second. That is, the upper bulb initially contains X grams of sand.

How many grams of sand will the upper bulb contains after t seconds?

Constraints

1≤X≤10^9

1≤t≤10^9

X and t are integers.

Input

The input is given from Standard Input in the following format:

X t

Output

Print the number of sand in the upper bulb after t second.

Sample Input 1

100 17

Sample Output 1

83

17 out of the initial 100 grams of sand will be consumed, resulting in 83 grams.

Sample Input 2

48 58

Sample Output 2

0

All 48 grams of sand will be gone, resulting in 0 grams.

Sample Input 3

1000000000 1000000000

Sample Output 3

0

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.io.PrintWriter;
import java.util.Scanner;

public class Main {
    static private Scanner scan = new Scanner(System.in);
    public static void main(String args[]) {
        int int1 = Integer.parseInt(scan.next());
        int int2 = Integer.parseInt(scan.next());
//        int int3 = Integer.parseInt(scan.next());
//        String temp_str1 = "";
//        String temp_str2 = "";
        int temp_int1 = 0;
//        String str1 = scan.next();
        int ans_int = 0;
        String ans = "";
//        double ans_dob = 0;
        ans_int = int1-int2;
        if(ans_int<0){
            ans_int = 0;
        }

        PrintWriter out = new PrintWriter(System.out);
        out.println(ans_int);
        out.flush();
        scan.close();
    }
}