#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char cuvinte[1005][1005];
char s[10000005];
char sep[] = "- !,";
int main()
{
	fin.getline(s, 10000005);
	int lg = strlen(s);
	char *p;
	p = strtok(s, sep);
	int k = 1;
	while (p)
	{
		strcpy(cuvinte[k++], p);
		p = strtok(NULL, sep);
	}
	k--;
	int nrl = 0;
	for (int i = 1; i <= k; i++)
	{
		nrl =nrl+ strlen(cuvinte[i]);

	}
	int f = nrl / k;
	fout << f;
	return 0;
}