#include <iostream>
#include <algorithm>
#include <cstring>

using namespace std;

const int N = 1010;

int s[N];
int n;

int main()
{
    cin >> n;

    for (int i = 0; i < n; i ++) cin >> s[i];

    int res = 1e6;

    for (int i = 0; i < n - 1; i ++)
    {
        for (int j = i + 1; j < n; j ++)
        {
            res = min(res, abs(s[j] - s[i]));
        }
    }

    cout << res;
    return 0;
}