#include <iostream>
#include <fstream>
#include <string.h>

using namespace std;

int main()
{
    int i,nrlit=0,nrc=0;
    char s[100];
        FILE *f;
        f=fopen("text.in","rt");
        fgets(s,100,f);
        fclose(f);

        for(i=0;i<strlen(s);i++)
            {
                if((s[i]>=97&&s[i]<=122)||(s[i]>=65&&s[i]<=90))
                   nrlit++;

                if((s[i]==' '&&s[i+1]!=' ')||s[i]=='-')
                    nrc++;
            }
        ofstream g("text.out");
        g<<nrlit/nrc;
        g.close();

}