#include <bits/stdc++.h>
#include<math.h>
#include<stdlib.h>
using namespace std;

int main(){
    int difference=1000000000;
    int n;
    cin>>n;
    int arr[n];
    int i=0;
    for(i=0;i<n;i++)
        cin>>arr[i];
    sort(arr,arr+n);
    for(i=0;i<n-1;i++)
        {
        if(abs(arr[i]-arr[i+1])<difference)
            difference=abs(arr[i]-arr[i+1]);
    }
          
    
cout<<difference;
    
    
    
    
    return 0;
}