#include <stdio.h>

int main()
{
	char S[101];
	int len, west = 0, east = 0;
	scanf("%s%n", &S, &len);

	for (int i = 0; i < len - 2; i++)
	{
		if (S[i] == S[i + 1] && S[i] == S[i + 2])
		{
			if (S[i] == 'O')
			{
				printf("East");
				return 0;
			}
			else
			{
				printf("West");
				return 0;
			}
		}
	}

	printf("NA");

	return 0;
}