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

int main() {
	int N, X[100000], MIN = pow(10, 8);
	cin >> N;
	for (int i = 0; i < N; i++) {
		cin >> X[i];
	}
	sort(X, X + N);
	for (int i = 1; i < N; i++) {
		if (X[i] != X[i - 1]) {
			MIN = min(MIN, X[i] - X[i - 1]);
		}
	}
	if (MIN == pow(10, 8)) MIN = 0;
	cout << MIN << endl;
}