/*

 * 输入字母判断第几列

 */

import java.util.Scanner;

public class JudgeClumns {

	public static void main(String[] args) {

		Scanner str = new Scanner(System.in);

		while(str.hasNextLine()){

			String Chars= str.next();

			if(!isEnglishAlphabet(Chars)){

				System.out.println("只支持输入字母");

//				return;

			}else{

				Chars = Chars.toUpperCase();

				int number = 0;

				for (int i = 0; i < Chars.length(); i++) {

					number =(((int)Chars.charAt(i)-64)+26*i);

				}

				System.out.println(number);

			}

		}

		str.close();

	}

	private static boolean isEnglishAlphabet(String str){

		String regex="[a-zA-Z]+";

		return str.matches(regex);

	}

}