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();

    let mut n = 0;
    if x[0] % 2 == 0 {
        n += 1
    }
    if x[2] % 2 == 0 {
        n += 1;
    }
    if x[4] % 2 == 0 {
        n += 1;
    }
    if n == 1 || n == 3 {
        println!(":-)");
    } else {
        println!(":-(");
    }
}