#include <bits/stdc++.h>
#include <cmath>
#include <cstdio>
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];
    }
    int i, small = a[0] - a[1];
    for(i = 0; i < n-1; ++i) {
        for (int j = i+1; j < n; ++j) {
            int diff = abs(a[i] - a[j]);
            if (diff < small)
                small = diff;
        }
    }
    // your code goes here
    printf("%d", small);
    return 0;
}