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";
// inputに入力データ全体が入る
const main = (input) => {
  const [a, b] = input.trim().split(" ").map(Number);
  return a + b < 10 ? `${a + b}` : "error";
};

// ※この行以降は編集しない (標準入力から一度に読み込みMainを呼び出します)
console.log(main(require("fs").readFileSync("/dev/stdin", "utf8")));