#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int n,s;
int main()
{int i,w = 0;
 bool ok = 0;
 char t[100000];
char c[1000000];
 fin.getline(c,1000000);
 int m = strlen(c);
 for(i = 0; i < m; ++i)
  if(isalpha(c[i]))
      {s++;
       if(!isalpha(t[w]) && ok)
          {n++;
           w = 0;
           ok = 0;
          }
      }
  else
    {t[++w] = c[i];
    ok = 1;
    }

if(n == 0)
  {fout<<0;
    return 0;
  }
fout<<s/n;
fin.close();
fout.close();
return 0;
}