while True: try: n_count = [] n = input() # 找到每个字符串出现的次数 for i in n: n_count.append(n.count(i)) # 找到最小值 min_index = min(n_count) result = '' for i in n: if n.count(i) == min_index: continue else: result += i print(result)

except:
    break