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 JavaScript (node.js v5.12) (judge verdict: Accepted)

function main (s) {
	s=s.split(" ");
	for(var i=0;i<2;i++)s[i]=parseInt(s[i]);
    console.log((s[0]>=s[1])?s[0]-s[1]:0);
}
 
main(require('fs').readFileSync('/dev/stdin', 'utf8'));