#include <iostream>
#include <fstream>

using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
    char c;
    int nrlit=0,cuv=0,ok=0;
    while(!(f.eof()))
    {
        f.get(c);
        if((c>='A' && c<='Z') || (c>='a' && c<='z'))
           {
             nrlit++;
             ok=1;
             }
        else
            if(ok)
            {cuv++;
              ok=0;}
    }
    g<<nrlit/cuv;
}