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: Accepted)

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;


public class Main{
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(
			new InputStreamReader(System.in));
		String[] input = br.readLine().split(" ");
		int a = Integer.parseInt(input[0]);
		int b = Integer.parseInt(input[1]);

		if(a<=0|b<=0){
			System.out.println("error");
		} else if(a>=10|b>=10){
			System.out.println("error");

		}else{
			int sum = a + b;
			if(sum >= 10){
				System.out.println("error");

			}else{
				System.out.println(sum);
			}
		}
		br.close();
	}
}