#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 ans;
    
    for (int i=0; i < n-1; i++){
        
        if (i==0) ans=abs (a [i]-a [i+1]);
        else if (abs (a [i]-a [i+1]) < ans) ans = abs (a [i]-a [i+1]);
        
       // cout << "i:" << i << ":ai:" << a [i] << ":ai+1;" << a [i+1] << endl;
    }
    
    cout << ans;
    
    return 0;
}