#include<fstream>

using namespace std;
int nTot,nCuv;
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;
}