#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++;
        if(s[i]==',')
            litere++;
    }
    if(s[0]=='-')
        litere++;
    lung=lung-litere-cuvinte-1;
    ofstream out ("text.out");
    out<<lung/cuvinte;
    out.close();
    return 0;
}