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

#define cuvant (s>='a' && s<='z') || (s>='A' && s<='Z')

fstream f("text.in",ios::in),g("text.out",ios::out);

long nrcuv,nrlit; char s;
int status=1;

int main()
{while(f>>resetiosflags(ios::skipws)>>s) {
		if(cuvant) {if(status==1)
			     {nrlit++; nrcuv++; status=0;}
			     else nrlit++; }
		else status=1;
	     }


     f.close();	    g<<nrlit/nrcuv;     g.close();    }