#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
 
typedef long long ll;
 
const ll mod=1e9+7;
 
const int dx[] = {0, 1, 0, -1};
const int dy[] = {1, 0, -1, 0};
 
#define all(x) x.begin(),x.end()
#define allr(x) x.rbegin(),x.rend()
#define rc(x)  return cout<<x<<"\n",0
#define sz(s)  (int) s.size()
#define pb push_back
#define mp make_pair
#define fr first
#define sc second
#define PI 3.14159265358979
 
using namespace std;
 
ll t;
 
int main() {
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	ifstream cin("text.in");
	ofstream cout("text.out");
	char x,prev;
	ll cuvinte=0;
	ll litere=0;
	bool ok=true;
	while (cin.get(x)) {
		if ((x>='a' && x<='z') || (x>='A' && x<='Z')) {
			if (ok) {
				cuvinte++;
				ok=!ok;
			}
			litere++;
		}
	else ok=true;
	}
		cout << (litere/cuvinte) << '\n';
 
}