#include <bits/stdc++.h>
#include <cmath>
#include <iostream>     
#include <algorithm>    
#include <vector>       

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];
    }
    // your code goes here
    int x = INT_MAX;

    sort(a.begin(), a.end());
   
    for(int i = 1; i < n; i++){
        if(abs((a[i-1]- a[i])) < x)
            x = abs((a[i-1]- a[i]));
    }
    cout << x;

    return 0;
}