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)

function main(input) {
  input=input.trim();
  const a = parseInt(input.split(" ")[0], 10);
  const b = parseInt(input.split(" ")[1], 10);
  if(a+b>=10){
    console.log("error");
  }else{
    console.log(a+b);
  }
}


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