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

int main() {
    int n;
    cin >> n;
    vector<int> a(n);
    for (int &e : a) cin >> e;
    
    sort(a.begin(), a.end());
    a.erase(unique(a.begin(), a.end()), a.end());
    
    int ans = (a.size() > 1 ? 1e9 : 0);
    for (int i = 0; i + 1 < a.size(); i++) {
        ans = min(ans, a[i + 1] - a[i]);
    }
    
    cout << ans << '\n';
    return 0;
}