#include <iostream>
using namespace std;
int main(void){
    char c;
    int f = 0;
    while(cin >> c && c != '\n'){
        
        if(c == 'O'){
            if(f < 0) f = 0;
            f++;
        }else{
            if(f > 0) f = 0;
            f--;
        }
        
        if(f == 3){
            cout << "East" << endl;
            return 0;
        }else if(f == -3){
            cout << "West" << endl;
            return 0;
        }
        
    }
    
    
    cout << "NA" << endl;
}