#include <stdio.h>
#include <string.h>

int main(void)
{
	char s[101];
	scanf("%s", s);
	if (strstr(s, "OOO") != NULL && strstr(s, "XXX") != NULL) puts(strstr("OOO", s) > strstr("XXX", s) ? "East" : "West");
	else if (strstr(s, "OOO") != NULL) puts("East");
	else if (strstr(s, "XXX") != NULL) puts("West");
	else puts("NA");
	return 0;
}