#include<fstream>
#include<string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int i,nr,dim;
char s[20000000];
int main ()
{
	f.get(s,2000000);
	for(i=0;s[i];++i)
	{
		if((s[i]<='z'&&s[i]>='a')||(s[i]<='Z'&&s[i]>='A'))
		{
			nr++;
			while((s[i]<='z'&&s[i]>='a')||(s[i]<='Z'&&s[i]>='A'))
			{
				dim++;
				i++;
			}
			i--;
		}
	}
	g<<dim/nr;
	return 0;
}