def main():
    S = list(input())

    east = 0
    west = 0
    for s in S:
        if s == "O":
            east += 1
            west = 0
            if east == 3:
                print("East")
                return
        else:
            west += 1
            east = 0
            if west == 3:
                print("West")
                return

    print("NA")

if __name__ == "__main__":  # {{{
    try:
        import test
        test.test()
    except:
        main()  # }}}