Strings_and_Numbers_task3.py

# -*- coding: utf-8 -*-
"""
Created on Fri Oct  7 13:55:20 2016

@author: Vladislav.Zaimov
"""

input_string = input("Input: ").lower()
encoding_scan = {k: 0 for k in r'''abcdefghijklmnopqrstuvwxyz!"#$%&\'()*+,-./:;<=>?@[\\]^_{|}~'''} #init encoding scan
for ch in input_string: #populate encoding scan
    encoding_scan[ch] += 1
sorted_scan = sorted(encoding_scan, key=encoding_scan.get, reverse=True) # sort scanned dictionary
encoding_table = {j: 9 - sorted_scan.index(j) for j in sorted_scan[:10]} # populate encoding table
decoded_string = ''.join([str(encoding_table[s]) if s in encoding_table else '+' for s in input_string]) #decode string and replace other characters with +
#print(decoded_string)
numbers_list = decoded_string.split('+')
#print(numbers_list)
sum_of_numbers = 0
for num in numbers_list:
    if num != '' :
        sum_of_numbers += int(num)
print(sum_of_numbers)