#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;

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

char alfabet[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";


int main()
{
  char cuv;
  long long n = 0;
  long long lng = 0;
  bool dcnumere = false;

  while(in.get(cuv))
  {
    if(strchr(alfabet,cuv))
      {
        if(!dcnumere)
        {
          dcnumere = 1;
          n++;
        }
        lng++;
      }
      else dcnumere = 0;


  }
  out<< 1LL * lng/n;


}