for i in range(1, 21):
    if i % 2 == 0:
        print(i)

2
4
6
8
10
12
14
16
18
20

text = input("Enter text: ")
print("Length:", len(text))

Enter text:  7


Length: 1

text = input("Enter text: ")
print("Reversed:", text[::-1])

Enter text:  5


Reversed: 5