use std::io;

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

    match (s.find("OOO"), s.find("XXX")) {
        (Some(e), Some(w)) if e < w => println!("East"),
        (Some(_), None) => println!("East"),
        (Some(e), Some(w)) if w < e => println!("West"),
        (None, Some(_)) => println!("West"),
        _ => println!("NA"),
    }
}