#include<iostream>
#include<fstream>
using namespace std;
long long nr,l,la;
char c,cop;
int main()
{
	ifstream f("date.in");
	ofstream g("date.out");
	cop=' ';
	while(!f.eof())
	{
		f>>c;
		if(('a'<=c&&c<='z')||('A'<=c&&c<='Z'))
			l++;
		else
			if(('a'<=cop&&cop<='z')||('A'<=cop&&cop<='Z'))
			{
				nr++;
			}
		cop=c;
	}
	if(('a'<=cop&&cop<='z')||('A'<=cop&&cop<='Z'))
		{
			nr++;
		}
	g<<(int)(l/nr)<<'\n';
	f.close();
	g.close();
	return 0;
}