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'

function main(s) {

  s = s.split('\n')[0].split(' ').map(n => Number(n));

  const a = s[0];
  const b = s[1];

  const sum = a + b;

  const ans = (sum < 10) ? sum : 'error';

  console.log(ans);
}

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