#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char  c;
int nrch, nrc, i, j;
int main()
{
    while(f.get(c))
    {
        if(('a'<=c&&c<='z')||('A'<=c&&c<='Z'))nrch++;
        else
        {
            if(j!=i)
                nrc++;
            j= i + 1;
        }

        i++;
    }
    g<<nrch/nrc;
    return 0;
}