#include <stdio.h>

int main()
{
	char S[101];
	fgets(S, 101, stdin);
	int i, len = 0, last = '\0';
	for (i = 0; S[i]; i++)
		if (last == S[i]) {
			if (++len >= 3) {
				puts((last == 'O') ? "East" : "West");
				return 0;
			}
		} else {
			len = 1;
			last = S[i];
		}
	puts("NA");
	return 0;
}