#include <fstream>
#include <cctype>

using namespace std;

ifstream in("text.in");
ofstream out("text.out");

char ch;
int nrcuv,nrlit;
bool ok = false;

int main()
{
    ios_base::sync_with_stdio(false);
    in.tie(0);
    while(in.get(ch))
    {
        if(isalpha(ch))
        {
            if(!ok)
            {
                ok = true;
                nrcuv++;
            }
            nrlit++;
        }
        else
            ok = false;
    }
    out << nrlit/nrcuv;
    return 0;
}