#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int i,j,k,l,cuv;
char s[1048580],a;
int main ()
{
	f.get(s,1000001);
	for (i=1;s[i];i++)
	{
		if (((s[i-1]>='a' && s[i-1]<='z') || (s[i-1]>='A' && s[i-1]<='Z')) && !(s[i]>='a' && s[i]<='z') && !(s[i]>='A' && s[i]<='Z'))
			cuv++;
		if ((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
		l++;
	}
	s[i]=' ';
	if (((s[i-1]>='a' && s[i-1]<='z') || (s[i-1]>='A' && s[i-1]<='Z')) && !(s[i]>='a' && s[i]<='z') && !(s[i]>='A' && s[i]<='Z'))
			cuv++;
		if ((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
		l++;
	if ((s[0]>='a' && s[0]<='z') || (s[0]>='A' && s[0]<='Z'))
		l++;
	g<<l/cuv;
	return 0;
}