s1 = {1, 2, 3}
s2 = {2, 3, 4}
s3 = {3, 4, 5}

# print(s4)


employees = ['Corey', 'Jim', 'Steven', 'April', 'Judy', 'Jenn', 'John', 'Jane']

gym_members = ['April', 'John', 'Corey']

developers = ['Judy', 'Corey', 'Steven', 'Jane', 'April']