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

int main(void) {
	int i,l,a = 0,b = 0,n = 1;
	char s[128];
	scanf("%s",s);
	l = strlen(s);
	for(i = 0;i < l;i++){
		if(s[i] == 'O'){a++;b = 0;}
		else if(s[i] == 'X'){a = 0;b++;}
		if(a >= 3){printf("East\n");n = 0;break;}
		if(b >= 3){printf("West\n");n = 0;break;}
	}
	if(n){printf("NA\n");}
	return 0;
}