fn main() {
    let mut line = String::new();
    std::io::stdin().read_line(&mut line);
    let (mut e, mut w) = (0, 0);
    for i in line.chars() {
        match i {
            'O' => e += 1,
            'X' => w += 1,
            _ => break,
        }
        if e == 3 {
            println!("East");
            return;
        }
        if w == 3 {
            println!("West");
            return;
        }
    }
    println!("NA");
}