# # Give output of a=20 b=10
# a = 10
# b = 20

# c = a
# a = b
# b = c

# print('a is', a)
# print('b is', b)

# Give output of d = 10, c = 20, a = 30, b = 40
a = 10
b = 20
c = 30
d = 40

e = d
d = a
a = c
c = b
b = e

print("a is:", a, "b is:", b, "c is:", c, "d is:", d)
