#include <fstream>

using namespace std;
ifstream in("text.in");
ofstream out("text.out");

bool cuvnou(char lt)
{
return ((lt<'a' || lt>'z') &&(lt<'A' || lt>'Z'));
}

int main()
{
string s;
int lit=0,cuv=0,i;
while (getline(in,s))
  {
  for(int i=0;i<=s.size();++i)
    {
    if(isalpha(s[i]))lit++;
    }
  for(int i=1;i<=s.size();++i)
    {
    if(cuvnou(s[i]) && cuvnou(s[i-1])==0)
      {
      ++cuv;
      }
    }
  }

if(cuv==0)
  out<<0;
else
  out<<lit/cuv;

return 0;
}