package main01;

import java.util.HashMap;

import java.util.Map.Entry;

import java.util.Scanner;

public class Main {

public static HashMap<Character, Integer> hashMap = new HashMap<>();

public static void main(String[] args) {

int i=0;

char ch = 'a';

for(;i<26;i++,ch++){

hashMap.put(ch, i);

}

Scanner sc = new Scanner(System.in);

while(sc.hasNext()){

String string = sc.nextLine();

long result = 0;

int length = string.length()-1;

for(int j=length;j>-1;j--){

result += Math.pow(26,length-j)*hashMap.get(string.charAt(j));

}

System.out.println(result);

}

}

}