#include<fstream>
#include<string>
using namespace std;
char a[400000];
int l,c;
void cit()
{
	ifstream f("text.in");
	f.get(a,100000);
	f.close();
}
void analiza()
{
	int x=100000;
	for(int i=0;i<=x+1;i++)
	{
		if(isalpha(a[i])||isdigit(a[i]))
		{
			l++;
		}
		if((isalpha(a[i-1])||isdigit(a[i])) &&( !isalpha(a[i])&&!isdigit(a[i])))
			c++;
	}
}
int main()
{
	cit();
	analiza();
	ofstream g("text.out");
	g<<l/c;
}