#include <stdio.h>
#include <string.h>
int main(void){
    // Here your code !
char s[100];
int a=0;
scanf("%s",s);
while(a<101){

    if(s[a]==s[a+1] && s[a+1]==s[a+2]){
       if(s[a]=='O')
       printf("East");
       else if(s[a]=='X')
       printf("West");
       else
       printf("NA");
       
       break;
    }
    a+=1;
}
}