Write a c program that satisfies the following specifications: Input a string from the keyboard The string is guaranteed to be a series of uppercase letters (A-2) ending with a carriage return. I.E. No characters other than A to Z The string is ciphertext that has been encrypted using railfence of depth 3, 4 or 5. Prompt user to enter 3,4 or 5 for railfence depth Output the recovered plaintext to the monitor