#include<iostream>
#include<string>
using namespace std;
int main(){
	string sa,sb="OX";
	int i,j,k;
	int s=0;
	cin>>sa;
	for(i=0,j=0,k=0;i<sa.size();i++){
		if(sa[i]==sb[s])j++;
		else s=1-s,j=1;
		if(j==3){
			k=1;
			break;
		}
	}
	if(k==1){
		if(s==0)cout<<"East"<<endl;
		else cout<<"West"<<endl;
	}else{
		cout<<"NA"<<endl;
	}
	return 0;
}