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 12.16.1) (judge verdict: Accepted)

'use strict'

const main = (INPUT) => {
  const [A, B] = INPUT.split('\n')[0].split(' ').map(n => Number(n))
  const ans = A + B
  console.log(ans >= 10 ? 'error' : ans)
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'))