#include <cstring>
#include <fstream>
#include <cstdlib>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
int i,n,v[100002],j=0,ok;
int sum,nr,x,y;
char c[10000005];
int main()
{ cin.getline(c,10000005,EOF);
for(i=0;i<=strlen(c);i++)
{
  if(isalpha(c[i]))
  { ok=1;
    if(nr==0) j++;
  nr++; }
  else { sum+=nr;
  nr=0;}
}
if(!ok) cout<<0; 
else cout<<sum/j;
return 0;
}