#include<iostream>
using namespace std;

int now = 0, straight = 0, type = 0, winner[101] = {};
char s[101];
bool win = false;

int main(){
	cin >> s;

	while (s[now] != 0){
		if (s[now] == 'O'){
			winner[now] = 1;
		}
		if (s[now] == 'X'){
			winner[now] = 2;
		}
		now++;
	}
	now = 0;
	while (winner[now] != 0){
		if (type == winner[now]){
			straight++;
			if (straight == 3){
				win = true;
				break;
			}
		}
		else{
			straight = 1;
			type = winner[now];
		}
		now++;
	}

	if (win){
		if (type == 1){
			cout << "East";
		}
		else{
			cout << "West";
		}
	}
	else{
		cout << "NA";
	}

	return 0;
}