#include <bits/stdc++.h>
using namespace std;
const int64_t INF = 100000000;
int main() {
	int64_t N;
	cin >> N;
	vector<int64_t> X(N);
	for(int i = 0; i < N; i++) cin >> X[i];
	sort(X.begin(), X.end());
	int64_t ans = INF;
	for(int i = 0; i < N - 1; i++) {
		if(X[i + 1] == X[i]) continue;
		ans = min(ans, X[i + 1] - X[i]);
	}
	if(ans == INF) ans = 0;
	cout << ans << endl;
	return 0;
}