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>
#include <string.h>
int main()
{
    long long int a,c;
    char b;
    scanf("%lld %c %lld",&a,&b,&c);
    if(b=='+')
    {
        printf("%lld\n",a+c);
        printf("Since %lld+%lld=%lld, the output should be %lld.\n",a,c,a+c,a+c);
    }
    else if(b=='-')
    {
        if(c>a)
        {
            printf("-%lld\n",c-a);
            printf("Since %lld-%lld=-%lld, the output should be -%lld.\n",a,c,c-a,c-a);
        }
        else
        {
            printf("%lld\n",a-c);
            printf("Since %lld-%lld=%lld, the output should be %lld.\n",a,c,a-c,a-c);
        }
    }
    return 0;
}