#include <stdio.h>
#include <string.h>
char s[101];
int main(void){
	int len,i,countE=0,countW=0;
	scanf("%s",s);
	len=strlen(s);
	for(i=0;i<len;i++){
		if(s[i]=='O'){countE++;countW=0;}
		else         {countE=0;countW++;}
		if(countE==3)     {printf("East");return 0;}
		else if(countW==3){printf("West");return 0;}
	}
	printf("NA");
	return 0;
}