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

namespace ABC063A
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, b,c;
            var word = Console.ReadLine().Split(' ');
            a = int.Parse(word[0]);
            b = int.Parse(word[1]);
            c = a + b;
            if (c>=10)
            {
                Console.WriteLine("error");
            }
            else
            {
                Console.WriteLine(c);
            }
            Console.ReadKey();
        }
    }
}