Write a python program that lets the user enter a string then prints the number of times each character appears in the string. The output should not include characters that do not appear in the string. Your program should not contain a multi-level if-else structure. (In fact, it is possible to write the program without using any conditionals). Hint: create a dictionary whose keys will be the characters and whose values will be their frequency of occurrence. Traverse the user string character by character. If the character exists in the dictionary, increment its frequency value. If it does not exist, add it and set its frequency value to 1.