#include <iostream>
#include <vector>
#include <string>

#define REP(i, a, b) for (int i = int(a); i < int(b); i++)
#define dump(s) cerr << __LINE__ << "\t:" << #s << " = " << (s) << endl
    
using namespace std;

int main () {
    string s;
    cin >> s;
    char fs = s[0];
    int cnt = 0;
    string ans = "NA";
    REP (i, 0, s.size()) {
	if (fs == s[i]) {
	    cnt++;
	} else {
	    cnt = 1;
	}
	if (ans.size() == 2 && cnt == 3) {
	    if (fs == 'O') ans = "East";
	    else ans = "West";
	}
	fs = s[i];
    }
    cout << ans << endl;
    return 0; 
}