#include <stdio.h>

int main(void) {
	char s[101];
	int i;
	int east = 0, west = 0;
	scanf("%s", s);
	for(i = 0;s[i] != '\0';i++){
		if(s[i] == 'O'){
			east++;
			west = 0;
		}
		else{
			east = 0;
			west++;
		}
		if(east == 3){
			printf("East\n");
			return 0;
		}
		else if(west == 3){
			printf("West\n");
			return 0;
		}
	}
	printf("NA\n");
	
	return 0;
}