#include <bits/stdc++.h>
using namespace std;

int main() {
	int N;
	cin >> N;
	if (N == 1) {
		cout << 0 << endl;
		return 0;
	}

	vector<int> v(N);
	for (int i = 0; i < N; i++) {
		cin >> v.at(i);
	}

	sort(v.begin(), v.end());
	int min = 2000000;
	for (int i = 1; i < N; i++) {
		int d = v.at(i) - v.at(i - 1);
		if (!d) continue;
		if (d < min) min = d;
	}

	if (min == 2000000) {
		min = 0;
	}
	cout << min << endl;
}