# import re
#
# #
#
# # str = ','.join(str(item) for inneritem in list for item in inneritem)
#
# # keywords = ('[', ']')
# # restr = re.sub('|'.join(keywords), '', '[[10, 20], [39, 182], [61, 90]]')
#
#
# s = '[]'
# str = '[[10, 20], [39, 182], [61, 90]]'
# a = re.findall('[\u4e00-\u9fa5a-zA-Z0-9]+', str, re.S)
# restr = ",".join(a)
# print(restr)

sets = set()
sets.add(1)
sets.add(2)
if sets.__contains__(1) == True:
    print('yes')
