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 Rust (1.42.0) (judge verdict: Accepted)

use std::io;

fn main() {
    let mut input_line:String = String::new();
    io::stdin().read_line(&mut input_line).expect("err");

    let inputs: Vec<&str> = input_line.split_whitespace().collect();

    let a:i64 = inputs[0].parse::<i64>().unwrap();
    let b:i64 = inputs[2].parse::<i64>().unwrap();
    let operand = inputs[1];

    if operand == "+" {
        print!("{}",a+b);
    }else if operand == "-"{
        print!("{}",a-b);
    }
}