# include <iostream.h>
# include <fstream.h>
# include <string.h>

int main ( void )
{
	register long nr_lit, nr_cuv;
	register int i;
	register char s[1000], *p=NULL, sep[]=" -";
	ifstream f("text.in");
	ofstream g("text.out");
	f.get(s,1000);
	nr_lit=0;
	nr_cuv=0;
	for(i=0;i<strlen(s);i++)
		if((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
			nr_lit++;
	p=strtok(s,sep);
	while(p!=NULL)
	{
		nr_cuv++;
		p=strtok(NULL,sep);
	}
	g<<nr_lit/nr_cuv;
	f.close();
	g.close();
	return 0;
}