#include <iostream>
#include <algorithm>
#include <string>
#include <cstdio>
using namespace std;

int main()
{
    string s; cin >> s;

    int e = 0, w = 0;
    for (int i = 0; i < s.size() - 2; i++) {
        if (s.substr(i, 3) == "OOO") return cout << "East\n", 0;
        if (s.substr(i, 3) == "XXX") return cout << "West\n", 0;
    }
    cout << "NA\n";

    return 0;
}