#include <bits/stdc++.h>

using namespace std;


    int findtheMinDiff(int arn[], int n)
{
 
   sort(arn, arn+n);
 

   int diff = INT_MAX;
 
 
   for (int i=0; i<n-1; i++)
      if (arn[i+1] - arn[i] < diff)
          diff = arn[i+1] - arn[i];

   return diff;
}
int main(){
    int n;
    cin >> n;
    int ar[n];
    
    for(int j = 0; j < n; j++){
       cin >> ar[j];
    }
     cout << findtheMinDiff(ar,n);
        return 0;
}