#include <stdio.h>
#include <string.h>
#include <ctype.h>
char sep[]=",.()+-!/ ",s[10001],*p;
int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	gets(s);
	int sum=0,nrc=0;
	p=strtok(s,sep);
	do
	{
		sum+=strlen(p);
		nrc++;
		p=strtok(NULL,sep);
	}while(p!=NULL);
	printf("%d\n",sum/nrc);
	return 0;
}