#include <bits/stdc++.h>
using namespace std;
int main()
{
	double sum = 0;
	int ans = 0;
	string s;
    cin >> s;
    for (int i = 0; i < s.length(); i++)
    {
        if (s[i] -'!' == 32)
        {
            sum += 4;
			ans++;
        }
        if (s[i] -'!' == 33)
        {
            sum += 3;
			ans++;
        }
        if (s[i] -'!' == 34)
        {
            sum += 2;
			ans++;
        }
        if (s[i] -'!' == 35)
        {
            sum += 1;
			ans++;
        }
        if (s[i] -'!' == 10)
            sum += 0.3;
        if (s[i] -'!' == 12)
            sum -= 0.3;
    }
	cout << fixed << setprecision(2) << sum / ans;
	return 0;
} //已AC

#include <bits/stdc++.h>
using namespace std;
int main()
{
	double sum = 0;
	int ans = 0;
	string s;
    cin >> s;
    for (int i = 0; i < s.length(); i++)
    {
        if (s[i] -'!' == 32)
        {
            sum += 4;
			ans++;
        }
        if (s[i] -'!' == 33)
        {
            sum += 3;
			ans++;
        }
        if (s[i] -'!' == 34)
        {
            sum += 2;
			ans++;
        }
        if (s[i] -'!' == 35)
        {
            sum += 1;
			ans++;
        }
        if (s[i] -'!' == 10)
            sum += 0.3;
        if (s[i] -'!' == 12)
            sum -= 0.3;
    }
	cout << fixed << setprecision(2) << sum / ans;
	return 0;
} //已AC

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    double sum = 0, n = 0;
    string s;
    cin >> s;
    for (int i = 0; i < s.length(); i++)
    {
        if(s[i] == 'A')
        {
            sum += 4;
            n++;
        }
        if(s[i] == 'B')
        {
            sum += 3;
            n++;
        }
        if(s[i] == 'C')
        {
            sum += 2;
            n++;
        }
        if(s[i] == 'D')
        {
            sum += 1;
            n++;
        }
        if(s[i] == '+')
        {
            sum += 0.3;
        }
        if(s[i] == '-')
        {
            sum -= 0.3;
        }
    }
    cout << fixed << setprecision(2) << sum / n;
    return 0;
}