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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Linq;
using System.Collections.Generic;
public class Hello
{

    public static void Main()
    {
        string[] s = Console.ReadLine().Split(' ');
        string ans = "error";
        if (int.Parse(s[0]) + int.Parse(s[1]) < 10) ans = (int.Parse(s[0]) + int.Parse(s[1])).ToString();
        Console.WriteLine(ans);
    }
}