#include <iostream>
#include <cstdlib>
#include <string>
#include <vector>

int main()
{
    std::string s;
    int o, x;
    o=0;x=0;
    std::cin >> s;
    for(auto i = s.begin(); i != s.end(); i++){
        if(*i == 'O'){
            x = 0;
            o++;
            if(o == 3){
                std::cout << "East" << std::endl;
                return 0;
            }
        } else if(*i == 'X'){
            o = 0;
            x++;
            if(x == 3){
                std::cout << "West" << std::endl;
                return 0;
            }
        }
    }
    std::cout << "NA" << std::endl;  
    return 0;
}