#include<fstream.h>
#include<string.h>
char s[1000000];
long long n,i,nr1,nrcuv;
int main()
{
  ifstream f("text.in");
  ofstream g("text.out");
   f.getline(s,100000);
   n=strlen(s);
  for(i=0;i<=n;i++)
   {
    if((s[i]>=65&&s[i]<=90)||(s[i]>=97&&s[i]<=122))
     nr1++;
    else
     if((s[i-1]>=65&&s[i-1]<=90&&nr1!=0)||(s[i-1]>=97&&s[i-1]<=122&&nr1!=0))
     nrcuv++;
   }
   g<<nr1/nrcuv;
 return 0;
}