#include<fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int n,cont;
char c;
int main()
    { while (f.get(c))
          if ((c<='z' && c>='a') || (c<='Z' && c>='A'))
              { n++;
               cont++;
               while (f.get(c) && ((c<='z' && c>='a') || (c<='Z' && c>='A')))
                    cont++;}
      g<<cont/n;
      return 0;}