#include <fstream>

using namespace std;

char x;
int litere,nrcuv,b;

int main()
{
    ifstream f("text.in");
    ofstream g("text.out");

    while(!f.eof())
    {
        f.get(x);

        if(('a'<=x && x<='z') || ('A'<=x && x<='Z'))
        {
            b=1;
            litere++;
        }
        else
        {
            if(b==1)
                nrcuv++;
            b=0;
        }
    }
    g<<litere/nrcuv;
}