#include <iostream>

using namespace std;

int numOfColumn(char arr[]);

int main()
{
	char colName[4];

	cin.getline(colName, 4);

	int output= numOfColumn(colName);

	cout << output;


	return 0;
}

int numOfColumn(char arr[])
{

	int colNum = 0;
	int index = 0;
	int const HELPER = 26;
	int counter = 0;

	if (arr[1] == 0)
	{
		colNum = arr[0] - '@';
		return colNum;
	}
	else	if (arr[2] == 0)
	{
		int firstNum;
		firstNum = arr[0];

		for (arr[0] = 'A'; arr[0] <= 'Z'; arr[0]++)
		{
			counter++;

			if (firstNum == arr[0])
			{
				firstNum = counter * HELPER;

				colNum = arr[1] - '@';

				return firstNum + colNum;
			}
		}
	}
	else
	{
		int secondNum = 0;
		int counterTwo = 0;
		int counter3 = 0;
		secondNum = arr[0];
		int helper = 0;
		int secondHelper = 0;
		int thirdNum = 0;
		thirdNum = arr[1];

		for (arr[0] = 'A'; arr[0] <= 'Z'; arr[0]++)
		{
			counter3++;

			if (arr[0] == secondNum)
			{
				secondHelper = counter3 * HELPER * HELPER;
				break;
			}
		}

		for (arr[1] = 'A'; arr[1] <= 'Z'; arr[1]++)
		{
			counterTwo++;

			if (thirdNum == arr[1])
			{
				secondNum = counterTwo * HELPER;

				colNum = arr[2] - '@';

				helper = secondNum + colNum;

			}
		}

		return secondHelper + helper;
	}

	return 0;
}