use std::io::stdin;

fn main() {
    let mut input = String::new();
    stdin().read_line(&mut input).ok();

    let x: Vec<&str> = input.trim().split(' ').collect();
    let x: Vec<u64> = x.into_iter().map(|x| x.parse().unwrap()).collect();

    if (x[0] + x[2] + x[4]) % 2 == 0 {
        println!(":-)");
    } else {
        println!(":-(");
    }
}