# https://yukicoder.me/problems/no/2599


def main():
    words = set()
    for _ in range(2):
        words.add(input())

    can = [
        "watermelon",
        "beachball",
        "shrinebell"
    ]

    for c in can:
        if c not in words:
            print(c)
            return




if __name__ == "__main__":
    main()