#set1.py

s = set([1,2,3])
print s


s = set([1,1,2,2,2,3])
print s

s.add(4)
print s

s.remove(4)
print s

a = ['c','b','a']
a.sort()
print a

b = 'bca'
print b.replace('a','A')

#s2 = set(1,2,[3,4])
#print s2

#s2 = set(1,2,(3,4))
#print s2