#include <cstdio>
#include <cstring>

using namespace std;

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

int main()
{
	int lgword, cnt, aux = 0;
	char c;
	
	lgword = cnt = 0;
	do {
		c = getc(f);
		if ( (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') )
			lgword++, aux++;
		else {
			if (aux)
				cnt++;
			aux = 0;
		}
	} while (c != EOF);
	
	if (cnt)
		fprintf (g, "%d\n", lgword / cnt);
	else
		fprintf (g, "0\n");
	
	fclose(f);
	fclose(g);
	
	return 0;
}