# import random
#
# alist = ['서아','권우','지호','지원','연우','준희']
# blist = []
# while True :
# name =random.choice(alist)
# if name not in blist:
# blist.append(name)
# if len(blist)>=3:
# break
# print(blist)
# import random
# lettrs = ['a','b','c','d','e','f','g','1','2','3','4','5','6','7','8']
# pwdList = random.sample(lettrs,k=8)
# pwdStr = ''.join(pwdList)
# print(pwdStr)
# import math
# c=math.sqrt(2)
# print(c)
# import math
# c=math.fabs(-2)
# print(c)
# import math
# c=math.gcd(6,8)
# print(c)
# import math
# c=math.ceil(3.14)
# print(c)
# import math
# c=math.floor(3.14)
# print(c)
# import math
# c=math.gcd(6,8)
# print(c)