#include <fstream>

using namespace std;
  char x;
  int lit = 0 , cuv = 0 , nrcuv = 0;
int main()
{
    ifstream cin("text.in");
    ofstream cout("text.out");
      while ( cin.get(x) ){
          if ( isalpha (x)){
             lit++;
             cuv = 1;}
          else{
              if (cuv)
                  nrcuv++;
               cuv = 0;}}
        cout << lit / nrcuv;
        return 0;}