#include<fstream>

using namespace std;

ifstream f("text.in");
ofstream g("text.out");

int lit,cuv;

char c;
void text()
{
	short ok = 0;
	
	while(f.get(c))
	{
		if((c >= 'a' && c<= 'z') || (c >= 'A' && c <= 'Z'))
		{
			lit++;
			if(ok == 0)
				cuv ++;
			ok = 1;
		}
		else
			ok = 0;
	}
}
int main()
{
	text();
	
	g<<lit/cuv<<'\n';
	
	g.close();
	
	return 0;
}