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

int n;

ll a[100100];

int main()
{
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
        if (a[i]<0) a[i]*=1;
    }
    sort(a+1, a+n+1);
    ll ans = 1e9*3;
    for (int i = 2; i <= n; i++)
    {
        ans = min(ans, abs(a[i]-a[i-1]));
    }
    cout << ans;
}