#include <fstream>
#define isup(x) (x>='a' && x<='z')
#define islow(x) (x>='A' && x<'Z')
using namespace std;

ifstream f("text.in");
ofstream g("text.out");

int maxs , i , ok;
char c;

int main()
{
	while(!f.eof())
	{
		f.get(c);
		if(isup(c) || islow(c)) ++maxs , ok = 1;
		else
		if(ok) ++i,ok = 0;
	}
	if(ok) ++i;
	g<<maxs/i;
	return 0;
}