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

#define rep(i, begin, end) for (__typeof(end) i = (begin) - ((begin) > (end)); i != (end) - ((begin) > (end)); i += 1 - 2 * ((begin) > (end)))
#define csl ios_base::sync_with_stdio(false);cin.tie(NULL);

const int N = 2*1e5+5;

int main()
{
    csl;
    long long int n,d;
    cin>>n;
    long long int a[N]={0};
    for(long long int i = 1;i <= n; i++)
    {
        cin>>a[i];
    }
    sort(a+1,a+n+1);
    long long int mx = 1e18;
    for(long long int i = 1;i <= n ;i++)
    {
        if(abs(a[i]-a[i-1]) < mx)
        {
            mx = abs(a[i]-a[i-1]);
        }
    }
    cout<<mx;
	return 0;
}