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

fstream f("text.in",ios::in),g("text.out",ios::out);
long k=0,lit=0, cuv=1;
char v[1000000];

void citire()
{while(f>>resetiosflags(ios::skipws)>>v[k])
{k++;} f.close();
}

void litere()
{for(long i=0;i<k;i++)
if( (v[i]>='A' && v[i]<='Z') || (v[i]>='a' && v[i]<='z') )
lit++;}

void cuvinte()
{for(long i=0;i<k;i++)
if( v[i]==char(32) ) cuv++;}

int main()
{citire();
litere();
cuvinte();
g<<lit/cuv;}