def main():
    s = input()
    s_list = list(s)
    f_list = []
    for i in range(0, len(s_list)-1):
        f_list.append(s_list[i] != s_list[i+1])
    f_list.append(True)
    for i in range(0, len(s_list)):
        if f_list[i]:
            print(s_list[i], end="")


if __name__ == "__main__":
    main()