# print("Hello!")
# x = 10
# y = 15
# import math
# print(math.pi)
# print(math.sqrt(10+15))
# import random
# print(random.randrange(0, 100, 1))
# print(random.randint(0, 100))

# x = complex(1, 2)
# y = complex(3, 4)
# print(x, y)

# print()
# s = "Hello world!"
# print(s)
# # s[0] = "M"
# s = s + "!!!"
# print(s)





