include<bits/stdc++.h>

define int long long

using namespace std; signed main() { int n, t = INT_MAX; cin >> n; vector <int> a(n); for(int i = 0; i < n; i ++) cin >> a [i]; sort (a.begin (), a.end ()); for(int i = 0; i < n - 1; i++) t = min(t, a [i + 1] - a [i]); cout << t;

    return 0;

}