# Lesson 3 Task 3: calculate a number of each letter occurrences in a string without using loops
# Author: Stanislav Mykhailenko
# License: Unlicense
# Return codes:
# 0 - OK
def getOccurrences(string, occurrences, currentElement):
if string[currentElement] in occurrences: occurrences[string[currentElement]] = occurrences[string[currentElement]] + 1
else: occurrences[string[currentElement]] = 1
if currentElement + 1 < len(string):
getOccurrences(string, occurrences, currentElement + 1)
occurrences = {}
string = input("Enter a string: ")
getOccurrences(string, occurrences, 0)
print("Occurrences sorted by letter: " + str(dict(sorted(occurrences.items()))))
print("Occurrences sorted by number: " + str(dict(sorted(occurrences.items(), key=lambda item: item[1], reverse=True))))
