#include <iostream>
#include <fstream>
using namespace std;
string s;
FILE f,g;
int n,i,l,c;
int main()
{
    ifstream f("text.in");
    getline(f,s);
    for(i=0;i<s.size();i++)
    {
        if((s[i]>='a' && s[i]<='z')||(s[i]>='A' && s[i]<='Z')) l++;
        if((s[i]==' ')||(s[i]=='-'&&s[i+1]!=' ')) c++;
    }

    ofstream g("text.out");
    l=l/c;
    g<<l;
    return 0;
}