#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin >> n;
    vector <int> ar(n);
    for (int i = 0; i < n; ++i)
        cin >> ar[i];
    sort(ar.begin(), ar.end());
    unsigned long long ans = 2000000001;
    unsigned long long pr;
    n--;
    for (int i = 0; i < n; ++i){
        pr = abs(ar[i] - ar[i + 1]);
        if (pr < ans)
            ans = pr;
    }
    cout << ans;
    return 0;
}