#include <fstream>
#include <string.h>

using namespace std;

char s[999999999];

int main(){
    ifstream in ("text.in");
    in.getline(s,999999999);
    in.close();
    int i,lung,cuvinte,litere;
    cuvinte=0;
    litere=0;
    lung=strlen(s);
    for(i=1;i<lung;i++){
            if(s[i]==' '||s[i]=='-')
                cuvinte++;
        else
            if(s[i]!=','&&i!=lung-1)
                litere++;
    }
    ofstream out ("text.out");
    out<<litere/cuvinte;
    out.close();
    return 0;
}