#include<fstream>
#include<string>
using namespace std;
int k,l,n,lg;
char v,c;
ifstream in("text.in");
ofstream out("text.out");
int main()
{
	int i;
	i=0;
	k=0;
	v='\0';
	while(in.get(c))
	{
		if((c<'A'||c>'Z')&&(c<'a'||c>'z'))
		{
			if(k==1)
			{
				k=0;
				n++;
			}
		}
		if(isalpha(c))
		{
			k=1;
			l++;
		}
		v=c;
	}
	if((v>='A'&&v<='Z')||(v>='a'&&v<='z')||isdigit(v))
		n++;
	in.close();
	out<<l/n;
	out.close();
}