from collections import Counter def my_func(in_string): res = sorted(Counter(in_string).items(), key=lambda x:x[1]) in_string = in_string.replace(res[0][0], "") for i in res: if i[1] == res[0][1]: in_string = in_string.replace(i[0], "") return in_string while True: try: print(my_func(input())) except (EOFError, KeyboardInterrupt): break