#include <fstream>
#include <iomanip>
#include <string.h>
using namespace std;

char *sc=new char[1100000],*cuv=new char[1100000],
      *lit="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
long nrcuv=0,nrlit=0,l,l2;
fstream fin("text.in",ios::in),fout("text.out",ios::out);
int main(){
  while (fin.get(sc,1100000)){
     strcat(sc," ");
     for(l=0;l<strlen(sc);l++)
       if(strchr(lit,sc[l])){
           nrlit++;
           if(!strchr(lit,sc[l+1])) nrcuv++;
           }       
  }    
  fout<<nrlit/nrcuv;    
fin.close(); fout.close();
}