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 Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

import java.io.*;
import java.util.*;

public class Main {
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);
		
		int A;
		int B;
		String op;
		int output = 0;
		
		String input = sc.nextLine();
		A = Integer.parseInt(input.substring(0, 1));
		op = input.substring(1, 2);
		B = Integer.parseInt(input.substring(2, 3));
	
		if(op.equals("+"))
		{
			output = A + B;
		}
		else if(op.equals("-"))
		{
			output = A - B;
		}
		
		System.out.println(output);
	}
}