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: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ABCtest
{
    delegate void Signal();
    class Program
    {
        static void Main(string[] args)
        {
            int A, B ,Ans;         
            string[] value = Console.ReadLine().Split(' ');

            if (value.Length == 1) return;
            
            if (!int.TryParse(value[0], out A) || !int.TryParse(value[1], out B)) return;
            if (A <= 1 || (B >= 9)) return;

            Ans = A + B;
            if(Ans >= 10) Console.WriteLine("erroe");
            else  Console.WriteLine(Ans);

            Console.ReadLine();


        }
    }
}