#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 = 0, nr = 0,lit = 0;
  while(a[i] != 0){
   if((a[i-1] >= 'A' && a[i-1] <= 'z')
   && (a[i] > 'z' || a[i] < 'A'))nr++;
   if(a[i] >= 'A' && a[i] <= 'z')lit++;
   i++;
  }



out << lit/nr;




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