#include <iostream>
#include <string>

void solve() {
    std::string s;
    std::cin >> s;

    for (int i = 0; i + 2 < (int)s.length(); ++i) {
        if (s.substr(i, 3) == std::string(3, 'O')) {
            std::cout << "East" << std::endl;
            return;
        }

        if (s.substr(i, 3) == std::string(3, 'X')) {
            std::cout << "West" << std::endl;
            return;
        }
    }

    std::cout << "NA" << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}