Deque Exercise

Create a program that accepts a sequence of characters that can be either letters or digits. Here is what the program should do with the sequence:

• Place all digits in one deque and all letters into another deque.
• Combine both deques into a third deque, with digits first and letters second.
• Print out contents of all three deques.

The program should prompt the user to enter a sequence of characters from the keyboard. The output of the program should clearly illustrate the operation.