#include <bits/stdc++.h>

using namespace std;

int main(){
    int n,min=1000;
    cin >> n;
    int a[n];
    for(int i = 0; i < n; i++){
       cin >> a[i];
    }
    sort(a,a+n);
 
   
   int diff = INT_MAX;

   for (int i=0; i<n-1; i++)
      if (a[i+1] - a[i] < diff)
          diff = a[i+1] - a[i];
 
   
   cout<< diff;
    return 0;
}