#include <iostream>
#include <algorithm>

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 minn = 10e9;
    for(int i = 1; i < n; i++) minn = min(minn, abs(a[i-1] - a[i]));
    cout << minn;
    return 0;
}