#include <stdio.h>
int main(void){
	char S[101];
	char judge[2] = "N";
	
	scanf("%s",S);
	
	for(int i = 0; S[i] != 0; i++){
		if( (S[i] == S[i+1])&&(S[i+1] == S[i+2]) ){
			judge[0] = S[i];
			break;
		}
	}
	
	if(judge[0] == 'O'){
		printf("East\n");
		return 0;
	}else if(judge[0] == 'X'){
		printf("West\n");
		return 0;
	}
	
	printf("NA\n");
	return 0;
}