#include <iostream>
#include <string>

int main() {
    std::string s;
    std::cin >> s;
    size_t a = s.find("OOO");
    size_t b = s.find("XXX");
    if (a == b){
        std::cout << "NA" << std::endl;
    } else if (a > b) {
        std::cout << "West" << std::endl;
    } else {
        std::cout << "East" << std::endl;
    }
}