use std::io::stdin;

fn get_line() -> String {
    let mut line = String::new();
    stdin().read_line(&mut line).ok();
    line
}

fn solve (s: &String) -> &str {
    let mut win = 'z';
    let mut ct = 0;

    for ch in s.trim().chars() {
        if ch == win {
            ct += 1;
        } else {
            ct = 1;
            win = ch;
        }
        if ct >= 3 {
            if win == 'O' {
                return "East";
            } else {
                return "West";
            }
        }
    }
    return "NA";
}

fn main() {
    let s = get_line();
    let ans = solve(&s);
    println!("{}", ans);
}