#include <fstream>
#include <string>
#include <vector>
#include <iostream>

using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int main()
{
 int sum=0;
 vector <string> s;
 string word;
 while (in >> word)
    s.push_back(word);
 for (int i=0;i<s.size();i++)
    for (int j=0;j<s[i].size();j++)
    if (!ispunct(s[i][j]))
    ++sum;
 out << sum/(s.size());

}