#include<bits/stdc++.h> using namespace std; int main(){ long long a[1001] = {}; int n; cin >> n; long long c; long long min = 99999999999; for (int i = 1; i <= n; i++) { cin >> a[i]; } for (int i = 1; i <= n; i++) { for (int j = i + 1; j <= n; j++) { c = abs(a[i] - a[j]); if (c < min) { min = c; } } } cout << min; return 0; }