#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <string.h>
#include <vector>
using namespace std;

#define ll long long
#define INF (1 << 30)
#define INFLL (1LL << 60)

#define FOR(i,a,b) for(ll i = (a);i<(b);i++)
#define REP(i,a) FOR(i,0,(a))
#define MP make_pair

int main() {
	string str;
	cin >> str;
	bool answered = false;
	int west = 0, east = 0;
	for(int i = 0;i < str.size();i++){
		if(str[i] == 'O'){
			east++;
			west = 0;
		}else{
			west++;
			east = 0;
		}
		if(answered == false && east == 3){
			answered = true;
			cout << "East" << endl;
		}else if(answered == false && west == 3){
			answered = true;
			cout << "West" << endl;
		}
	}
	if(!answered) cout << "NA" << endl;
	return 0;
}