Problem Statement

In a parallel universe, AtCoder holds AtCoder Big Contest, where 10^{16} problems are given at once.
The IDs of the problems are as follows, from the 1-st problem in order: A, B, ..., Z, AA, AB, ..., ZZ, AAA, ...
In other words, the IDs are given in the following order:

• the strings of length 1 consisting of uppercase English letters, in lexicographical order;
• the strings of length 2 consisting of uppercase English letters, in lexicographical order;
• the strings of length 3 consisting of uppercase English letters, in lexicographical order;
• ...

Given a string S that is an ID of a problem given in this contest, find the index of the problem. (See also Samples.)

Input

The input is given from Standard Input in the following format:
S

Output

Print the answer as an integer.

Constraints

• S is a valid ID of a problem given in AtCoder Big Contest.

Sample Input 1

AB

Sample Output 1

28

The problem whose ID is AB is the 28-th problem of AtCoder Big Contest, so 28 should be printed.

Sample Input 2

C

Sample Output 2

3

The problem whose ID is C is the 3-rd problem of AtCoder Big Contest, so 3 should be printed.

Sample Input 3

BRUTMHYHIIZP

Sample Output 3

10000000000000000

The problem whose ID is BRUTMHYHIIZP is the
10^{16}-th (last) problem of AtCoder Big Contest, so 10^{16} should be printed as an integer.

见题面 Input 部分

见题面 Output 部分