#include <fstream>
#include <iostream>
#include <string>
#include <string.h>

using namespace std;

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

int lungime, nr;

int main(){
  char chr;
  int trecut = 0, ascii;
  
  while (fin.get(chr)) {
    ascii=chr;
    if ((ascii>=97 && ascii<=122) || (ascii>=65 && ascii<=90)) {
      lungime++;
      trecut = 1;
    }else {
      if (trecut)
        nr++;
      trecut = 0;
    }
  }
  fout<<lungime/nr;
  return 0;
}