import sys def del_str(input_str): alpha_count = {} for i in input_str: alpha_count[i] = input_str.count(i) min_count = min(alpha_count.values()) max_count = max(alpha_count.values()) if min_count == max_count: return input_str if len(alpha_count.keys()) == 1: return input_str new_str = '' for i in input_str: if alpha_count[i] == min_count: continue new_str += i return new_str def main(): while True: input_str = sys.stdin.readline().strip() if input_str == '': break print(del_str(input_str)) main()