#include<iostream>
#include<fstream>
using namespace std;
int main ()
{
    ifstream x("text.in");
    ofstream y("text.out");
    char sp[]="!@#$%^&*()][><?/'; +|\''",c;
    unsigned short nr=0,cv=0;
    while(!x.eof())
    {
        x>>c;
        if(!strchr(sp,c))
        {

            while(!x.eof() && !strchr(sp,c))
            {
                nr++;
                x>>c;
            }
            cv++;
        }
    }
    if(c!=0)
    y<<nr/cv;
    x.close();
    y.close();
    return 0;
}