#include<cstdio>
#include<cstring>

int main(){
	char s[101];
	scanf("%s",s);
	int l = strlen(s);
	for(int i=2;i<l;i++){
		if(s[i]=='O'&&s[i-1]=='O'&&s[i-2]=='O'){
			printf("East\n");
			return 0;
		}
		if(s[i]=='X'&&s[i-1]=='X'&&s[i-2]=='X'){
			printf("West\n");
			return 0;
		}
	}
	printf("NA\n");
}