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# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Linq;

class Mainclass 
{
    static void Main()
    {
        int[] A = Array.ConvertAll(Console.ReadLine().Split(' '),int.Parse);
        if (A[0] + A[1] < 10)
        {
            Console.WriteLine(A[0]+A[1]);
        }
        else
        {
            Console.WriteLine("error");
        }
    }
}