#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());
    unsigned int abs_diff = -1;
    for(int i = 0; i < a.size(); i++){
        if (a[i+1] - a[i] < abs_diff)
          abs_diff = a[i+1] - a[i];
    }
    cout<<abs_diff;
    return 0;
}