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

int main(){
    int n;
    cin >> n;
    int arr[n];
    for(int a_i = 0; a_i < n; a_i++){
       cin >> arr[a_i];
    }
    sort(arr,arr+n);
    int i;int diff=INT_MAX;
    for(i=0;i<n-1;i++)
        {
        int temp=arr[i+1]-arr[i];
        if(temp<0){temp*=-1;}
        if(temp<diff)
            {
            diff=temp;
            }
        
    }
    cout<<diff<<endl;
    return 0;
}