#include <fstream>

using namespace std;

ifstream in("text.in");
ofstream out("text.out");
int l=0,w=0;
char c;

int main()
{
    bool t;
    while(in.get(c))
    {
        if(isalnum(c))
        {   w++;
            l++;
        }
    }
    out << l/w;

    return 0;
}