#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define sci(fd) scanf("%d",&fd)
#define scll(fd) scanf("%lld",&fd)
#define pb push_back
#define mp make_pair
#define MOD 1000000007
#define PI 3.1415926535897932
#define pii pair < int,int > 
#define pll pair < ll,ll >
#define fi first
#define se second
#define LOGN 20
const ll infi=1000000000000000009;
int ar[100009];
int main()
{
    int i,j,n,a;
    sci(n);
    for(i=0;i<n;i++)
    {
        sci(ar[i]);
    }
    sort(ar,ar+n);
    int mini=abs(ar[0]-ar[1]);
    for(i=2;i<n;i++)
    {
        mini=min(mini,abs(ar[i]-ar[i-1]));
    }
    printf("%d\n",mini);
    return 0;
}