找出两个只出现一次的数字，其余的数字都出现了两次

n = list(input()) l = len(n) new1 = [] flag = 0 for i in range(l): for j in range(l): if n[i] == n[j] and i != j: flag = 1 if flag == 1: new1.append(n[i]) flag = 0 for ch in n: if ch not in new1: print(ch)