#include <vector>
#include <tuple>
#include <iostream>
#include <algorithm>
using namespace std;

int main()
{
    int n;
    cin >> n;
    vector<int>arr(n);
    vector<int>b(n-1);
    for (int arr_i=0;arr_i<n;arr_i++) {
        cin >> arr[arr_i];
    }
    sort(begin(arr), end(arr));
    for (int i=0;i<n-1;i++) {
        b[n-2-i]=arr[n-1-i]-arr[n-2-i];
    }
    sort(begin(b), end(b));
    cout << b[0] << endl;
    return 0;
}