#include<bits/stdc++.h> using namespace std; int main(){ string s; int e=0,w=0; cin>>s; if(s.size()<3) { cout<<"NA"<<"\n"; return 0; } for(int i=0;i<s.size()-2;i++){ if(s[i]=='O'&&s[i+1]=='O'&&s[i+2]=='O') { cout<<"East"<<"\n"; return 0; } else if(s[i]=='X'&&s[i+1]=='X'&&s[i+2]=='X') { cout<<"West"<<"\n"; return 0; }else cout<<"NA"<<"\n"; } return 0; }