nums = [4,3,2,7,8,2,3,1]

# print({1,2,3}-{2,3})
# print(set(nums))
# #
# print([i for i in range(1, len(nums)+1) if i not in set(nums)])

# for i in range(len(nums)):
#     index = abs(nums[i]) - 1
#     nums[index] = - abs(nums[index])
#
#
# lis = []
# for i in range(len(nums)):
#     if nums[i] > 0:
#         lis.append(i+1);
# print(lis)
#
# for i in range(len(nums)):
#     nums[i] = ' '
#
# print([i for i in range(len(nums))])

print(3==1|-7)