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C - abc285_brutmhyhiizp

Score : $300$ points

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.)

Constraints

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

Input

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

$S$

Output

Print the answer as an integer.

AB

28

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

C

3

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

BRUTMHYHIIZP

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.