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


int main(){
char s[101];
int i;
int x=0;
gets(s);
for(i=0;i<strlen(s);i++){
	if(s[i]=='O'&&s[i+1]=='O'&&s[i+2]=='O'){
		
		printf("East\n");
		break;
		x++;
		
		
	}else if(s[i]=='X'&&s[i+1]=='X'&&s[i+2]=='X'){
		printf("West\n");
		break;
		x++;
		
	}
	
	
	
	
	
	
}
if(x==0){
	
	printf("NA\n");
	
}

	return 0;
}