#include <bits/stdc++.h>
#include <cmath>

using namespace std;

int main(){
    int n, minAbsDiff{0}, absDiff{0};
    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());
    minAbsDiff = abs(a[0] - a[1]);
    for(int a_i = 0; a_i < n; a_i++){
       absDiff = abs(a[a_i] - a[a_i+1]);
        if(absDiff == 0) {
            minAbsDiff = 0;
            break;
        }
        else if(absDiff < minAbsDiff) minAbsDiff = absDiff;
    }   
    cout << minAbsDiff;
    return 0;
}