#include <bits/stdc++.h>

using namespace std;

int main(){
    int n, diff = 9999999;
    cin >> n;
    vector<int> a(n);
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
    // your code goes here
    sort (a.begin(), a.begin()+n);
    for(int i = 0; i< n-1;i++)
        {
            if(diff > abs(a[i] - a[i+1]))
        {
            diff = abs(a[i] - a[i+1]);
        }
    }
    cout << diff;
    return 0;
}