class Problem0486:
    def solve(this):
        s = list(input())
        for i in range(len(s) - 2):
            if s[i] == s[i+1] == s[i+2] == "O":
                print("East")
                return
            elif s[i] == s[i+1] == s[i+2] == "X":
                print("West")
                return
        print("NA")

if __name__ == "__main__":
    problem = Problem0486()
    problem.solve()