//
//  MinAbsDifArray.cpp
//  HR
//
//  Created by Admin on 10/02/2017.
//  Copyright © 2017 Jose. All rights reserved.
//
#include <cstring>
#include <string.h>
#include <map>
#include <deque>
#include <queue>
#include <stack>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <algorithm>
#include <vector>
#include <set>
#include <complex>
#include <list>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <string>

using namespace std;

#define pb push_back
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define sz size()
#define rep(i,m) for(int i=0;i<(int)(m);i++)
#define rep2(i,n,m) for(int i=n;i<(int)(m);i++)
#define For(it,c) for(__typeof(c.begin()) it=c.begin();it!=c.end();++it)
#define mem(a,b) memset(a,b,sizeof(a))
#define mp make_pair
#define F first
#define S second
#define pb push_back
#define forn(i, n) for(int i = 0 ; (i) < (n) ; ++i)
#define eprintf(...) fprintf(stderr, __VA_ARGS__),fflush(stderr)
#define pw(x) (1LL<<(x))
#define DBGV(vari) //cout << #vari<< " = "<< (vari) <<endl;

typedef stringstream ss;
typedef pair<int, int> pii;
typedef vector<pii> vpii;
typedef vector<string> vs;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector<vector<int> > vvi;
typedef long long ll;
typedef long double ld;
typedef vector<ll> vll;
typedef pair<double,double> pdd;
typedef pair<long,long> pll;
typedef vector<pll> vpll;
typedef vector<vpll> vvpll;
//const int oo = (int) 1e9;
const double PI = 2 * acos(0);
//const double eps = 1e-9;
const ll inf=1e10;

int main(){
    int n;cin>>n;
    vll v(n);
    ll lo=inf;
    ll hi=-inf;
    forn(i, n){
        ll x;
        cin>>x;
        //if(x<0)x=-x;
        v[i]=x;
        //lo=min(lo,x);
        //hi=max(hi,x);
    }
    sort(begin(v), end(v));
    for(int i=1;i<n;i++){
        ll d=v[i]-v[i-1];
        if(d<0)d=-d;
        if(d<lo) lo=d;
    }
    //ll d=v[i]-v[i-1];
    //if(d<lo) lo=d;
    
    cout<<lo<<endl;
    
    return 0;
}