#include <bits/stdc++.h>

using namespace std;

int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    char spatiu[]={' ','-'};
    int s1=0,s2=0;
    string n;
    getline(f,n);
    for (int i=1;i<n.size()-1;++i)
    {
        if (isalpha(n[i])) s1++;
        if (n[i]==spatiu[0]||n[i]==spatiu[1]) s2++;
    }
    g<<s1/(s2+1);
    return 0;
}