#include <iostream>
#include <string>
#include <fstream>
using namespace std;
int n,nr = 0,nr1 = 0;
string s;
int main()
{
 ifstream f("text.in");
 ofstream g("text.out");
 getline (f,s);
 n = s.size();
 for (int i = 0 ; i < n; i++)
{
    if (( s[i] == ' ') || (s[i] == ',' )|| (s[i] == '.') || (s[i] == '!') || (s[i] == '-') && ((s[i] >= 'a' || s[i] <= 'z') || (s[i] >= 'A' || s[i] <='Z' )))
        nr ++;
}
for (int i = 0; i < n; i++)
{
    if ( s[i] == '.' || s[i] == ',' || s[i] == ' ' || s[i] == '-')
    nr1++;
}
g << (n-nr1)/nr;
    return 0;
}