#include <stdio.h>

int main(void)
{
	int i;
	char  str[100];
	scanf("%s",str);
	char wf=0,ef=0;
	for(i=0;i<sizeof(str);i++){
		if(str[i]=='O' && str[i+1]=='O' && str[i+2]=='O'){
			ef=1;
			break;
		}else if( str[i]=='X' && str[i+1]=='X' && str[i+2]=='X'){
			wf=1;
			break;
		}
	}
	if(ef==1)
		printf("East");
	else if(wf==1)
		printf("West");
	else
		printf("NA");
	
	return 0;
}