#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;
	ll cuvinte=0;
	ll litere=0;
	bool ok=true;
	while (cin.get(x)) {
		if ((x>='a' && x<='z') || (x>='A' && x<='Z')) {
			litere++;
		}
		else if ((x==' ' || x=='!' || x=='.' || x=='?' || x==',') && ok==true) {
			ok=false;	
		}
		else if ((x==' ' || x=='!' || x=='.' || x=='?' || x==',') && ok==false) {
			cuvinte++;	
		}
	}
	cout << (litere/cuvinte) << '\n';


}