#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int cuv , lit , contor;
char a;
int main()
{
  while(fin.get(a))
  {
      if((a>='A' && a<='Z' ) || (a>='a' && a<='z'))
      {
          lit++;
          contor = true;
      }
      else
        if(contor)
      {
          contor = false;
          cuv++;
      }
  }
  if(contor) cuv++;
  fout<<lit/cuv;
}