# -*- coding: utf-8 -*-
import math,string,itertools,fractions,heapq,collections,re,array,bisect

class ValueOfString:
    def findValue(self,s):
        dic = {}
        for i in range(len(s)):
            if s[i] in dic:
                dic[s[i]] = dic[s[i]] + 1
            else:
                dic[s[i]] = 1
        ret = 0
        sum = 0
        for i in sorted(dic):
            sum += dic[i]
            ret += (ord(i) - ord("a") + 1) * sum * dic[i]
        return ret