#include<fstream>
using namespace std;
int main(){
            ifstream fin("text.in");
            ofstream fout("text.out");
            string a;
            fin>>a;
            long long int i,nrc=0,nrcifre=0;
           for(i=1;i<a.length();i++){
                                        if('a'<=a[i]&&a[i]>='Z'&&(a[i-1]=='-'||a[i-1]==' '||a[i-1]=='.'||a[i-1]==',')){
                                                                                                                        nrc++;
                                                                                                                      }
                                        if('a'<=a[i]&&a[i]<='Z') nrcifre++;
                                    }
            fout<<nrcifre/nrc;
         }