#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());
    int smallest_difference = 2000000001;
    int diff = 0;
    
    for(int a_i = 1; a_i < n; a_i++){
       diff = abs(a[a_i]-a[a_i-1]);
       if(diff<smallest_difference){
           smallest_difference = diff;
       }
    }
    
    cout << smallest_difference;
    // your code goes here
    return 0;
}