#include <iostream>
#include <string>

using namespace std;

int main() {

    string S;

cin>>S;
if(S.size()>=3){
    for(int i=0;i<S.size()-2;i++){
if(S[i]=='O'&&S[i+1]=='O'&&S[i+2]=='O'){
cout<<"East"<<endl;
return 0;
}
if(S[i]=='X'&&S[i+1]=='X'&&S[i+2]=='X'){
cout<<"West"<<endl;
return 0;
}
}
}

	cout<<"NA"<<endl;
	return 0;
}