str = "sourabh"
print(str[::-1])
print(str[0:2:8])
print(str[:])
print(str[0:6])

set1 = {1,5,6,4}
set2 = {4,8,9,7}
print(set1-set2)

A = {'a', 'b', 'c', 'd'}
B = {'c', 'd', 'e' }
C = {}

print(A.symmetric_difference(B))
print(B.symmetric_difference(A))

