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

char text[8388608];
char* delimitatori = " ,./;'\[]<>?:\"|{}1234567890-=!@#$%^&*()_+";
int nr_cuvinte;
int lungime;

int main()
{
	freopen("text.in", "r", stdin);
	freopen("text.out", "w", stdout);

	gets(text);
	char* cuvant = strtok(text, delimitatori);
	while (cuvant != NULL)
	{
		lungime += strlen(cuvant);
		++nr_cuvinte;
		cuvant = strtok(NULL, delimitatori);
	}

	printf("%d", lungime / nr_cuvinte);
	return 0;
}