#include<iostream.h>
#include<string.h>
#include<fstream.h>
#include<ctype.h>
ifstream f("text.in");
ofstream g("text.out");

main()
{
	char c; 
	int nrlit=0, nrcuv=0,contor=0;
	while(f.get(c))
	{
		if(isalpha(c)) 
			{ 
				nrlit++;
				contor++;
		}
		else if(contor!=0)
		{ 	nrcuv++;
			contor=0;
		}
	}
	if(contor!=0) nrcuv++;
	g<<nrlit/nrcuv;
}