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 C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
int main(void)
{
	unsigned long long a, b, sum;
	char t;
	
	scanf("%llu %c %llu", &a, &t, &b);
	if (t == '+'){
		printf("%llu\n\n", a + b);
		printf("Since %llu + %llu = %llu, the output should be %llu.", a, b, a + b, a + b);
	}
	else if (t == '-')
		printf("%llu\n", a - b);
	
	return 0;
}