#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
    int n; cin >> n;
    int a[n];
    for (int i = 0; i < n; i++) cin >> a[i];
    sort(a,a+n);
    int mn = 1e9;
    for (int i = 1; i < n; i++) {
        if (a[i-1] != a[i]) mn = min(mn, a[i]-a[i-1]);
    }
    if (mn == 1e9) mn = 0;
    cout << mn << endl;
    return 0;
}