fn main() {
    let stdin = std::io::read_to_string(std::io::stdin()).unwrap();
    let mut stdin = stdin.split_ascii_whitespace();

    let s: String = stdin.next().unwrap().parse().unwrap();

    println!("{}", output(solve(s)));
}

fn solve(s: String) -> &'static str {
    for s in s.into_bytes().windows(3) {
        if s[0] == s[1] && s[1] == s[2] {
            return match s[2] {
                b'O' => "East",
                b'X' => "West",
                _ => unreachable!(),
            };
        }
    }
    "NA"
}

fn output(ans: &'static str) -> &'static str {
    ans
}