#include <iostream>
#include <fstream>
using namespace std;
char a[100000];
int nr,l;
int main ()
{
	ifstream fin("text.in");
	ofstream fout("text.out");
	fin.get(a,10000);
	for (int i=0;a[i];i++)
	{
		int p=0;
		while ((a[i]>='a' && a[i]<='z') || (a[i]>='A' && a[i]<='Z'))
		{
			i++;
			p=1;
			l++;
		}
		if (p)
		{
			nr++;
			i--;
		}
	}
	if (nr==0) fout<<'0';
	else 
	fout<<l/nr;
}