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)

// package app;

import java.util.Arrays;
import java.util.Scanner;
import java.util.stream.Stream;

public class Main {

    public static void main(final String[] args) throws Exception {
        final Scanner sc = new Scanner(System.in);

        // final String N = sc.next();

        final int A = sc.nextInt();
        final int B = sc.nextInt();
        // final int N = sc.nextInt();
        // final int D = sc.nextInt();
        // System.out.println();
        System.out.println(A + B >= 10 ? "error" : A + B);

        // System.out.println(A <= X && A + B >= X ? "YES" : "NO");

    }
}