#include<iostream>
using namespace std;main(){string s;cin>>s;int a=0;for(int i=0;i+3<=s.length();i++)if(s[i]==s[i+1]&&s[i]==s[i+2]&&!a)a=s[i]=='O'?1:-1;cout<<(a?a+1?"East":"West":"NA")<<endl;}