#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <fstream>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>
#include <numeric>
#include <iterator>

typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;





int main()
{

    int Q;
    Q = 1;
    //cin >> Q;


    while (Q--) {
        int n;
        cin >> n;
        vector<ll>t(n);
        for (int i = 0; i < n; i++) {
            cin >> t[i];
        }
        ll ans = 1e13;
        sort(t.begin(), t.end());
        for (int i = 1; i < n; i++) {
            if (t[i] == t[i - 1])continue;
            ans = min(ans, t[i] - t[i - 1]);
        }
        if (ans == 1e13)ans = 0;
        cout << ans;
    }
    return 0;
}