#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;

int main()
{
    char a[255],v[]="-_=+,./?!@#$%^&*();'\][{}|<> ",s[]=" -";
    ifstream f("text.in");
    ofstream g("text.out");
    f.getline (a,100);
    int i,k=0,c=1;
    for (i=0;i<strlen(a);i++)
    {
        k++;
        if (strchr(v,a[i]))
                k--;
        if (strchr (s,a[i]))
                c++;
    }
    g<<k/c;
}