#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> a(n);
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
    
    sort(a.begin(), a.end());
    int diff = abs(a[0] - a[1]);
    for (int i = 0; i < n; i++) {
            if (abs(a[i] - a[i + 1]) < diff) {
                diff = abs(a[i] - a[i + 1]);
            }
    }
    
    cout << diff;
    
    return 0;
}