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

int main() {
    ios_base::sync_with_stdio(false);
    #define ll long long int
    
        ll n;
       cin>>n;
        priority_queue<int> p;
        for(ll i=0;i<n;i++)
        {
            ll a;
            cin>>a;
            p.push(a);
        }
        ll ans=INT_MAX;
        ll a=p.top();
        p.pop();
        while(!p.empty())
        {
            ll b=p.top();
            ans=min(ans,abs(b-a));
            a=b;
            p.pop();
        }
        cout<<ans<<endl;
    
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}