use std::io::*;
use std::str::FromStr;

#[allow(dead_code)]
fn get_line() -> String {
    let stdin = stdin();
    let mut line = String::new();
    stdin.lock().read_line(&mut line).expect("io error.");
    line.trim().to_string()
}

#[allow(dead_code)]
fn cast<T: FromStr>(s: &str) -> T {
    s.parse().ok().expect("parse error.")
}

#[allow(dead_code)]
fn get_vec<T: FromStr>() -> Vec<T> {
    (&get_line()).split(' ').map(cast::<T>).collect()
}

fn main() {
    let s: Vec<char> = get_line().chars().collect();
    let n: usize = s.len();

    if n < 3 {
        println!("NA");
        return;
    }
    
    for i in 0..n-2 {
        if s[i] == s[i + 1] && s[i + 1] == s[i + 2] {
            println!("{}",
                match s[i] {
                    'O' => "East",
                    'X' => "West",
                    _ => "WTF",
                }
            );
            return;
        }
    }

    println!("NA");
}