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