#include <fstream>
#include <iomanip>
using namespace std;

char c,c2;
long nrcuv=0,nrlit=0,l,l2;
fstream fin("text.in",ios::in),fout("text.out",ios::out);
int main(){
  fin>>c; l=(c>='A' && c<='Z' || c>='a' && c<='z');  
  while (fin>>c2){
    l2=(c2>='A' && c2<='Z' || c2>='a' && c2<='z'); 
    if(l) {nrlit++; if (!l2) nrcuv++;}    
    c=c2;l=l2;   
  }
  if(c>='A' && c<='Z' || c>='a' && c<='z') {nrlit++,nrcuv++;}
  fout<<nrlit/nrcuv;    
fin.close(); fout.close();
}