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

int main() {
	int N;
	cin >> N;
	vector<int>  X(N);
	for (int i = 0; i < N; i++)
	{
		cin >> X[i];
	}
	sort(X.begin(), X.end());
	int ans = 1<<30;
	for (int i = 0; i < N - 1; i++)
	{
		if (X[i] == X[i + 1]) continue;
		ans = min(ans, X[i + 1] - X[i]);
	}
	if (ans == (1 << 30)) ans = 0;
	cout << ans << endl;
}