#include <bits/stdc++.h>


using namespace std;

int INF = 1e9+7;


int main()
{
    ios_base::sync_with_stdio(false);
    int n;
    cin >> n;
    vector <int> arr(n,0);
    for (int i=0;i<n;i++){
        cin >> arr[i];
    }
    sort(arr.begin(),arr.end());
    int ans = INF;
    for (int i=1;i<n;i++){
        ans=min(ans, abs(arr[i]-arr[i-1]) );
    }
    cout << ans;
    return 0;
}