#include<stdio.h>
#include<string.h>

FILE *f=fopen("text.in","r");
FILE *g=fopen("text.out","w");

int main()
{
	char s[20],m[20][20],*p;
	int nr=0,i=0,lcuv=0;
	while(!feof(f))
	{
		fgets(s,20,f);
		p=strtok(s," ,!-?");
		while(p)
		{
			strcpy(m[i],p);
			p=strtok(NULL," ,!-?");
			i++;
		}
		nr=i;
	}
	for(i=0;i<nr;i++)
		lcuv=lcuv+strlen(m[i]);
	fprintf(g,"%d",lcuv/nr);
	return 0;
}