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

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

 while ( fin.good() )
    {
      getline (fin,line);
	  token=(char *) strtok(&line[0]," ,.-!@#`~$%^&*+][)(?/}{");
	
	while(token!=NULL)
	{
	sum+=strlen(token);
	word_number++;
	token=strtok(NULL," ,.-!@#`~$%^&*+][)(?/}{");
	}
}	
fout<<sum/word_number;
return 0;
}