Problem:
Score : 100 points

Problem Statement

You are given two integers A and B as the input. Output the value of A + B.

However, if A + B is 10 or greater, output error instead.

Constraints

A and B are integers.

1 ≤ A, B ≤ 9

Input

Input is given from Standard Input in the following format:

A B

Output

If A + B is 10 or greater, print the string error (case-sensitive); otherwise, print the value of A + B.

Sample Input 1

6 3

Sample Output 1

9

Sample Input 2

6 4

Sample Output 2

error

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


public class Main{

    public static void main(String[] args){
        Integer a = Integer.parseInt(args[0]);
        Integer b = Integer.parseInt(args[1]);
        if(a + b < 10){
            System.out.println(a + b);
        }else{
            System.out.println("error");
        }
    }

}