#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;


ifstream f("text.in");
ofstream g("text.out");

bool litera(char c)
{
    return (c>='a' && c<='z') || (c>='A' && c <= 'Z');
}

int main()
{
   char c,c1=',';
   int nr=0,nr_cuv=0;
   while(!f.eof())
   {
       f.get(c);

       if (litera(c)) nr++;
       if (litera(c) && !litera(c1)) nr_cuv++;
       c1=c;
   }

   g<<(int)(nr/nr_cuv)<<'\n';

   f.close();
   g.close();
}