#include <iostream>
#include<cstdio>
#include<cstring>
#include<string>
using namespace std;

int main()
{
	int ans = 0;
	char a[27] = "12312312312312312341231234";
	string b;
	getline(cin, b);
	for (size_t i = 0;i<b.length(); i++)
	{
		if (b[i] == ' ')
			ans++;
		else
			ans += a[b[i] - 'a']-'0';
	}
	cout << ans;
	return 0;
}