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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Sandglass2
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] strInp =Console.ReadLine().Split(' ');

            int intX = int.Parse(strInp[0]);
            int intT = int.Parse(strInp[1]);

            int intParts = intX - intT;

            if (intParts > 0)
            {
                Console.WriteLine(intParts);
            }
            else
            {
                Console.WriteLine(0);
            }
           


            // for debug
            return;
        }
    }
}