#include <bits/stdc++.h>

using namespace std;
ifstream in("text.in");
ofstream out("text.out");
string sir;
int numar()
{
    int k=0;
    for(int i=0; i<=sir.size(); i++)
        if(isalpha(sir[i]))
            k++;
}
int main()
{
    in>>sir;
    int k=0,p=0;
    while(in>>sir)
    {
        k++;
        if(sir[k]!= ',' && sir[k]!= '!' && sir[k]!= '?' && sir[k]!= '-' && sir[k]!= '.' )
            p=p+sir.size();
    }

    out<<(p-1)/(k+1);
    return 0;
}