#include<fstream>
#include<string.h>
using namespace std;
char sir;
int main()
{ifstream f ("text.in");
 unsigned int k=0, nrc=0, prec=0;
 while(!f.eof()) {
	 sir=f.get();
	 if((sir>='a'&&sir<='z')||(sir>='A'&&sir<='Z')) {
		 nrc++;
		 if(prec==0) {
			 k++;
			 prec=1;}}
	 else prec=0;}
 ofstream g ("text.out");
 g<<nrc/k;
 g.close();
 f.close();
 return 0;}