#include <stdio.h>
using namespace std;


int main()
{
	int ss,m,k,o;
	char c;
	FILE *f, *g;
	f = fopen("text.in","r");
	g = fopen("text.out","w");
	ss=0;
	k=0;
	while (!feof(f))
	{
		o=0;
		fscanf(f,"%c", &c);
		while (((c>='a') && (c<='z')) || ((c>='A') && (c<='Z')))
		{
			o++;
			fscanf(f,"%c", &c);

		}
		if (o!=0)
		{
			k++;
			ss = ss + o;
		}
	}
	m = ss / k;
	fprintf(g,"%d",m);
	fclose(f);
	fclose(g);



}