#include <bits/stdc++.h>
#include<iostream>
using namespace std;
void findMinDiff(int arr[], int n)
{
     sort(arr, arr+n);
   int diff = INT_MAX;
   for (int i=0; i<n-1; i++)
      if (arr[i+1] - arr[i] < diff)
          diff = arr[i+1] - arr[i];
   cout<<diff;
}
int main(){
    int n;
    cin >> n;
    int a[n];
    for(int i=0;i<n;i++)
        cin>>a[i];
    findMinDiff(a,n);
    return 0;
}