#include <iostream>
#include <fstream>
using namespace std;
int nCuv,nTot;
char a, b='!';
char litera ( char x )
{
    if((x>='a' && x<='z')||(x>='A' && x<='Z')) return true;
                          else           return false;
}
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    while(!f.eof())
    {
        a=f.get();
        if(litera(a)==true) nTot++;
        if(litera(a)==true&&litera(b)==false) nCuv++;
        b=a;
    }
    g<<nTot/nCuv;
    return 0;
}