#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char c,r;
int nrcuv,nrlit;
int main()
{
    while(f>>c>>noskipws)
    {
        if((c>='A' && c<='Z') ||(c>='a' && c<='z'))
        {
            if(r==' ' || r=='-')
                nrcuv++;

            nrlit++;
        }
        r=c;
    }
    g<<nrlit/nrcuv;
    return 0;
}