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

int n, a[100005], Ans;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> n; Ans = 1e9;
    for (int i = 1; i <= n; i++) cin >> a[i];
    sort(a + 1, a + n + 1);
    for (int i = 2; i <= n; i++) {
        if (a[i] == a[i - 1]) continue;
        Ans = min(Ans, a[i] - a[i - 1]);
    }

    if (Ans != 1e9) cout << Ans;
    else cout << 0;
}