#include<bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
int A[101];
int main(){
	string S;
	cin>>S;
	REP(i,S.size()){
	    if(S[i]=='O'){
	       A[i]=0;
	    }else{
	       A[i]=1;
	    }
	}
	int cnt=1;
	int p=A[0];
	if(S.size()<2){
	   cout<<"NA"<<endl;
	   return 0;
	}
	for(int i=1;i<S.size();i++){
	    if(p==A[i]){
	       cnt++;
	       if(cnt>=3){
	          if(p==0){
	             cout<<"East"<<endl;
	          }else{
	             cout<<"West"<<endl;
	          }
	          return 0;
	       }
	    }else{
	       cnt=1;
	       p=A[i];
	    }
	}
	cout<<"NA"<<endl;
	return(0);
}