#include <bits/stdc++.h>

using namespace std;
ifstream in("text.in");
ofstream out("text.out");
char a[10000];
int main()
{
    in.getline(a,999);
   int i, j, nr = 0,lit = 0;
  for(i = 0; a[i] != 0; i++)
  {
    if((a[i] >= 'A' && a[i] <= 'Z') ||
       (a[i] >= 'a' && a[i] <= 'z'))
       {
        lit++;
        for(j = i + 1; j < 999; j++)
         if((a[j] >= 'A' && a[j] <= 'Z') ||
            (a[j] >= 'a' && a[j] <= 'z'))
              lit++;
         else
         {
          nr++;
          i = j;
          j = 1000;
         }
       }
  }
out << lit/nr;




 in.close();
 out.close();
 return 0;
}