Problem:
Score : 100 points

Problem Statement

Joisino wants to evaluate the formula "A op B".
Here, A and B are integers, and the binary operator op is either + or -.
Your task is to evaluate the formula instead of her.

Constraints

1≦A,B≦10^9

op is either + or -.

Input

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

A op B

Output

Evaluate the formula and print the result.

Sample Input 1

1 + 2

Sample Output 1

3

Since 1 + 2 = 3, the output should be 3.

Sample Input 2

5 - 7

Sample Output 2

-2

Solution in JavaScript (node.js v5.12) (judge verdict: Wrong Answer)

function main(input) {
 	input = input.trim()
	const a = parseInt(input.split('')[0],10);
	const op = input.split('')[1];
 	const b = parseInt(input.split('')[2],10);
	if (op == '+') {
      console.log(a + b);
    }
 	if (op == '-') {
      console.log(a - b);
    }
}
 
main(require("fs").readFileSync("/dev/stdin", "utf8"));