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