#include <bits/stdc++.h>
using namespace std;
 
int main()
{
   int n;
  cin>>n;
  int arr[n];
   for(int i=0;i<n;i++)
    cin>>arr[i];
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;
   return 0;
}