Write a Python program that asks a user to input a string. Then clear all the whitespaces present in that string and output it back to the user.

Example scenarios:

Program Prompt: Enter your string:

User response: $\text{'}$h e ll o $!\text{'}$

Program prints: 'hello!$\text{'}$

Program Prompt: Enter your string:

User response: 'How Are Y OU $123$ Doing $?\text{'}$

Program prints: 'HowAreYOU$123$Doing?$\text{'}$