#include <fstream>
#include <string.h>
using namespace std;

int main()
{
char textf[100000];
char *token;
long sum=0,word_number=0;
ifstream fin("text.in");
ofstream fout("text.out");

token=strtok(textf," ,.-)(?/}{");
while(token!=NULL)
	{
	sum+=strlen(token);
	word_number++;
	token=strtok(NULL," ,.-)(?/}{");
	}
fout<<sum/word_number;
return 0;
}