#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char c;
int w=0,i,l=0,back=0;
int main()
{
while(!f.eof())
{f.get(c);
if ((c>=65 && c<=90)||((c>=97)&&(c<=122))) {l++;back=1;}
else if (back) {w++;back=0;}
}
if (back) w++;
g<<l/w;
return 0;
}