#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    int a[1000];
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    int m = INT32_MAX;
    for (int i = 0; i < n - 1; i++) {
        for (int j = i + 1; j < n; j++) {
            if (abs(a[j] - a[i]) < m)m = abs(a[j] - a[i]);
        }
    }
    cout << m << endl;
    return 0;
}