#include <fstream>

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


    }
    out<<lit/cuv;

    return 0;
}