#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define nmax 1000001
FILE *f=fopen("text.in","r"), *g=fopen("text.out","w");
char s[nmax],*p,q[]=",./<>?|;:'[]{}`~!@#$%^&*()-_=+*\n";
int nr,sum;
int main()
{
	fgets(s,nmax,f);
	p=strtok(s,q);
	while(p)
	{ sum+=strlen(p);
	  nr++;
	  p=strtok(NULL,q);
	}
	fprintf(g,"%d\n",sum/nr);
	fclose(g);
	return 0;
}