You must write a function called cryptogram_alphabet. It must receive no arguments and produce one string return value. This function will use input to ask the user to type an alphabet (i.e., type the 26 letters of the English alphabet in any order). If the argument contains all 26 letters then the argument, converted to uppercase if necessary, is the return value. If, on the other hand, the argument does not contain all 26 letters or contains duplicate letters, you will print an error message and return the unmodified alphabet "ABCDEFGHIJKLMNOPQRSTUVWXYZ