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 Rust (1.15.1) (judge verdict: Accepted)


use std::io;

fn main() {
    let mut line = String::new();
    io::stdin().read_line(&mut line);
    let mut line = line.split_whitespace();
    let a = line.next().unwrap().parse::<i64>().unwrap();
    let b = line.next().unwrap().parse::<i64>().unwrap();

    let sum = a + b;
    if 10 <= sum {
        println!("error");
    }
    else {
        println!("{}", sum);
    }
}