#include <bits/stdc++.h>

using namespace std;
int findMinDiff(long long 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];
 
   return diff;
}
int main(){
    int n;
    cin >> n;
    long long a[n];
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
    cout<<findMinDiff(a,n);
    // your code goes here
    return 0;
}