#include <stdio.h>

int main(){
        char S[100];
        int count=0;
        for(int i=0;i<100;i++){
                scanf("%c", &S[i]);
                if(S[i]=='\n'){
                        count = i;
                        break;
                }
        }
        if(count == (0||1)){
                printf("NA\n");
                goto fin;
        }
        for(int i=0;i<100;i++){
                if((S[0]=='O')&&(S[1]=='O')&&(S[2]=='O')){
                        printf("East\n");
                        break;
                }else if(S[i]=='X'&&S[i+1]=='X'&&S[i+2]=='X'){
                        printf("West\n");
                        break;
                }else{
                        printf("NA\n");
                }
        }
fin:  return 0;
}