#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define Would
#define you
#define please

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	int N;
	cin >> N;

	set<int> ST;
	rep(i, N) {
		int X;
		cin >> X;
		ST.insert(X);
	}

	if (ST.size() == 1) {
		co(0);
	}
	else {
		int mae = -1e9;
		int kotae = 1e9;
		for (auto p : ST) {
			kotae = min(kotae, p - mae);
			mae = p;
		}
		co(kotae);
	}




	Would you please return 0;
}