#include <bits/stdc++.h>
using namespace std;
char c;
unsigned long long nrL,nrCuv;
bool acc=0;
ifstream f("text.in");
ofstream g("text.out");

int main()
{

    while(f.get(c))
    {
        if((c>='a' && c<='z') || (c>='A' && c<='Z')) {
                 nrL++;
                 acc=1;
            }
        else if(acc)
        {
            nrCuv++;acc=0;
        }

    }
    if(nrCuv!=0)
    g << nrL/nrCuv;
    else g << 0;

    return 0;
}