PROGRAMMING:JMU Python Caesar encryption algorithm

Write a Caesar password encryption program, receive the text and key K input by the user, and replace the letters A-Z and A-Z in the plaintext with the k-th letter after them.
###Input format:
Receiving two lines of input, the first line is plaintext to be encrypted, and the second line is key K.
###Output format:
Output encrypted ciphertext.
###Input example:
Here is a set of inputs. For example:
```in
Hello World!
three
```
###Output example:
The corresponding output is given here. For example:
```out
Khoor Zruog!
```







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