#include<iostream.h>
#include<fstream.h>
int litera(char z)
	{
	if ((z>='a'&&z<='z')||(z>='A'&&z<='Z')) return 1;
	return 0;
	}

char x,y;
int main()
{
long nrc,lcuv,k,ok;
ifstream f("text.in");
ofstream g("text.out");
f.get(x);
while (!litera(x)&&!f.eof())
	f.get(x);
lcuv=nrc=k=0;
while (!f.eof())
	{
	ok=1;
	while (litera(x)&&!f.eof())
		{
		++lcuv;
		f.get(x);
		ok=0;
		}
	if (!litera(x))
		{
		nrc++;
		while (!litera(x)&&!f.eof()) f.get(x);
		}
	}
if (litera(x)) nrc++;
if (ok==0&&litera(x)) ++lcuv;
g<<lcuv/nrc;
f.close();
g.close();
return 0;
}