#include <iostream>
#include <fstream>

using namespace std;
long long x=1,d,nr,ok,nrl;
char k;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
    while(!f.eof())
    {
        f.get(k);
        if((k>='a'&&k<='z')||(k>='A'&&k<='Z'))
        {nrl++;
         ok=1;
        }
        else if(ok){nr++;ok=0;}

    }
    g<<nrl/nr;


    return 0;
}