# 집합(set)
# 중복 안됨, 순서 없음
# my_set = {1,2,3,4,5}
# java = {"유재석","김태호","양세형"}
# python = set(["유재석","박명수"])

# print(java & python)

from random import *
lst = [1,2,3,4,5]
# print(lst)
shuffle(lst)
print(lst)

# from random import *
# users = range(1,21)
# print(type(users))
# users = list(users)
# print(type(users))
# shuffle(users)
# print(users)
# print(sample(users,4))