#include <bits/stdc++.h>
#include<limits.h>

using namespace std;

int main(){
    int n,difference,min=INT_MAX;
    cin >> n;
    vector<int> a(n);
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
   /* for(int a_i=1;a_i<n;a_i++)
        {
        for(int a_j=0;a_j<a_i;a_j++)
            {
                  if((a[a_i]>=0&&a[a_j]>=0)||(a[a_i]<=0&&a[a_j]<=0))
                  {
                      difference=a[a_i]-a[a_j];
                  if(difference<0)
                      difference=-difference;
                  if(difference<min)
                      min=difference;
                  if(min<1)
                      break;
                  }
        }
        if(min==0)
            break;
    } */
    sort(a.begin(),a.end());
    for(int i=0;i<n-1;i++)
        {
        if(a[i+1]-a[i]<min)
            min=a[i+1]-a[i];
        if(min<1)
            break;
    }
    cout<<min;
return 0;
}