#include <iostream>
#include <stdio.h>
using namespace std;

int main(void)
{
    string s;
    cin >> s;
    int e = 0;
    int w = 0;

    for (int i = 0; i < s.length(); i++)
    {
        if (s[i] == 'O')
        {
            e++;
            w = 0;
        }
        else
        {
            w++;
            e = 0;
        }
        if (e == 3 || w == 3)
            break;
    }

    if (e == 3)
        printf("East\n");
    else if (w == 3)
        printf("West\n");
    else
        printf("NA\n");
    return 0;
}