#include <stdio.h>

int main(){
	char S[100];
	unsigned e = 0, w = 0;
	scanf("%s", S);
	for(unsigned i = 0; S[i]; i++){
		if(S[i] == 'O'){
			e++;
			w = 0;
		}else{
			w++;
			e = 0;
		}
		if(e == 3){
			printf("East\n");
			return 0;
		}else if(w == 3){
			printf("West\n");
			return 0;
		}
	}
	printf("NA\n");
	return 0;
}