// No.486 3 Straight Win(3連勝)
// https://yukicoder.me/problems/no/486
//

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

string solve(string &S);

int main() {
    string S;
    cin >> S;
    string ans = solve(S);
    cout << ans << endl;
}

string solve(string &S) {
    const string WEST_WIN = "XXX";
    const string EAST_WIN = "OOO";

    auto w_pos = S.find(WEST_WIN);
    auto e_pos = S.find(EAST_WIN);
    if (w_pos == string::npos) {
        if (e_pos == string::npos)
            return "NA";
        else
            return "East";
    } else {
        if (e_pos == string::npos)
            return "West";
        else
            return (w_pos < e_pos? "West": "East");
    }
}