#include<fstream>
 using namespace std;
  int main()
{
ifstream fin("text.in");
ofstream fout("text.out");
char d,f;
int c1,c2,p;
 while(fin.get(c))
 {
    if (( f >= 'a' && f <= 'z') || (f>= 'A' && f <= 'Z' ) )
 {
     c1++;
 }
          
  else
  if (( d >= 'a' && d <= 'z') || (d >= 'A' && d <= 'Z' ) )
  d=f;
c2++;
 }
      
      
      fout<<c1/c2;
      
    fin.close();
    fout.close();
    return 0;
}