#include <bits/stdc++.h>

using namespace std;

int main(){

int cnt = 0;

string s;

cin >>s;

for(int i = 1;i<s.length();i++){
	if(s[i] == s[i-1]){
		cnt ++;
	}
	else cnt=0;

	if(cnt == 2){
		if(s[i] == '○'){
			cout << "East" <<endl;
			break;
		}
		else {
			cout << "West" <<endl;
			break;
		}
	}
}
cout  << "NA" << endl;
	

return 0;
}