#include <iostream>
#include <string>
using namespace std;
int main(){
	string St;
	int x=0,y=0,east=0,west=0;
	cin>>St;
	while(1){
		if(St[y]=='O'){
			east++;
			west=0;
		}else{
			west++;
			east=0;
		}
		y++;
		if(east==3){
			cout<<"East"<<endl;
			return 0;
		}
		if(west==3){
			cout<<"West"<<endl;
			return 0;
		}
		if(y==St.size()){
			cout<<"NA"<<endl;
			return 0;
		}
	}
}