x = "Hello"
print(x)
a = str("world")
print(a)

print()
print(x[-1])
print(x[0])
print(x[4])
print()
print(x[1:3])
print(x[1:])
print(x[:3])
print(x[:10])

print()
x = "I'm %d y.o" % 171
print(x)
print(str(1))
print(len("12345"))
print(sum([1, 2, 3]))

print()
# Exercise 1. Make a program that displays your favourite actor/actress.
print("Christian Bale")
# Exercise 2. Try to print the word ‘lucky’ inside s.
s = print("lucky")
print(s)
# Exercise 3. Try to print the day, month, year in the form “Today is 2/2/2016”.
print("Today is %d/%d/%d" % (4, 4, 2019))