#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <iomanip>
#include <cmath>
#include <functional>
using namespace std;
#define diff(x,y) ((x > y) ? (x - y) : (y - x))
#define us(x) (x > 0) ? x : x * -1
const int MAX = 100001;

int main() {
	long long int n, min = MAX;
	cin >> n;
	vector <long long int> x(n);
	for (int i = 0; i < n; i++)
		cin >> x[i];
	if (n < 2) {
		cout << 0 << endl;
		return 0;
	}
	sort(x.begin(), x.end());
	for (int i = 0; i < n - 1; i++) 
		if (x[i + 1] - x[i] < min && x[i + 1] != x[i])	min = x[i + 1] - x[i];
	if (min == MAX)	cout << 0 << endl;
	else			cout << min << endl;
	return 0;
}