#include <iostream>
#include <fstream>
#include <string.h>
//#include <vector>
//#include <queue>
//#include <algorithm>

using namespace std;
const int nmax = 100000000;
char s[nmax];

int main(){
	freopen("text.in", "r", stdin);
	freopen("text.out", "w", stdout);
	fgets(s, nmax, stdin);
	unsigned long long litere = 0, nrCuvinte = 0;
	int p = 0;
	for (int i = 0; s[i] != '\0'; i++) {
		if (isalpha(s[i])) {
			if (!p) {
				p = 1; nrCuvinte++;
			}
			else p++;
		}
		else {
			if (p){
				litere += p; p = 0;
			}
		};
	}
	if (!p) litere += p;

	if (nrCuvinte == 0) {
		printf("%lld ", 0);
		return 0;
	}
	
	printf("%lld ", litere / nrCuvinte);
	fclose(stdin);
	fclose(stdout);
	return 0;
}