#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(void){
char s[105];
int o=0,x=0;
scanf("%s",s);


if(strlen(s)<=2){printf("NA\n");return 0;}

for(int i=0;s[i]!='\0';i++){
if(s[i]=='O'){o++;x=0;}
else{x++;o=0;}

if(o==3){printf("East\n");return 0;}
else if(x==3){printf("West\n");return 0;}
}

printf("NA\n");

}