#include <bits/stdc++.h>

using namespace std;


int main(){
    int n, x, i;
    int close1, close2;
    cin >> n;
    vector<int> a(n);
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
    // your code goes here
    sort(a.begin(), a.begin() + n);
    x = abs(abs(a[1]) - abs(a[0]));
    for (i = 2; i != n ; ++i) 
        x = min(x, abs(abs(a[i]) - abs(a[i-1])));
    cout << x;
    
    return 0;
}