#include<fstream.h>
#include<iomanip.h>
int i,j,nr,m;
char a,b;
int main(){
ifstream f("text.in");
ofstream g("text.out");
while(!f.eof())
	{f>>resetiosflags(ios::skipws)>>a;
	if(((b<'a')||(b>'z'))&&((b<'A')||(b>'Z'))&&((a>='a')&&(a<='z'))||((a>='A')&&(a<='Z')))
		nr++;
	if(((a>='a')&&(a<='z'))||((a>='A')&&(a<='Z')))
		m++;
	b=a;
	}
j=m/nr;
g<<j;
f.close();
g.close();







return 0;
}