// #define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
// ランレングス圧縮
string runLength(const string& s) {
    string t;
    char c = '\0';
    int cnt = 0;
    for (int i = 0; i <= s.size(); ) {
        if (c != s[i]) {
            if (cnt > 0) t += c + to_string(cnt);
            cnt = 0;
            c = s[i];
        } else ++i, ++cnt;
    }
    return t;
}
int main() {
    // Input
    string S;
    cin >> S;

    // Judge
    stringstream ss(runLength(S));
    while (!ss.eof()) {
        char c;
        int x;
        ss >> c >> x;
        if (x >= 3) {
            cout << (c == 'O' ? "East" : "West") << endl;
            return 0;
        }
    }

    // Not Exist Winner
    cout << "NA" << endl;
}