#include <fstream>

using namespace std;
ifstream in ("text.in");
ofstream out ("text.out");
int main()
{
    int cuv=0, nr=0, i=0;
    char x;
    while (in.get(x))
    {
        if ( (x>='a' && x<='z') || (x>='A' && x<='Z'))
        {
            nr++;
            i=1;
        }
        else if ( i == 1)
        {
            i=0;
            cuv++;
        }

    }
    out<<nr/cuv;
    return 0;
}