#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <map>
#include <list>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <iomanip>

using namespace std;

int main(void)
{
	int n;
	int res = 10000000;
	int x[100000];


	cin >> n;

	for (int i = 0; i < n; i++) {
		cin >> x[i];
	}
	sort(x, x + n);

	for (int i = 0; i < n; i++) {
		if (x[i] != x[i + 1]) {
			res = min(abs(x[i + 1] - x[i]), res);
		}
	}
	if (res == 10000000) res = 0;

	cout << res << endl;

	return (0);
}