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 JavaScript (node.js v5.12) (judge verdict: Accepted)

'use strict'

const main = (input) => {
    const A = parseInt(input.split(' ')[0])
    const B = parseInt(input.split(' ')[1])
    if(A + B < 10){
        console.log(A + B)
    }else{
        console.log('error')
    }
}

main(require('fs').readFileSync('/dev/stdin', 'utf-8'))