#include<fstream>
#include<stdio.h>

using namespace std;

int main()
{
  // ifstream in("text.in");
  // ofstream out("text.out");

  freopen("text.in","r",stdin);
  freopen("text.out","w",stdout);

  long long letters = 0, words = 0, check = 0;
  char caracter;

  while(scanf("%c", &caracter) != EOF) {
    if((caracter >= 'a' && caracter <= 'z') || (caracter >= 'A' && caracter <= 'Z')) {
      letters ++;
      check = 0;
    }
    else {
      check ++;
    }

    if(check == 1 && letters != 0) 
      words ++;

  }

  //  out << letters / words << "\n";
  printf("%lld\n", letters/words);

  return 0;
}