#include <bits/stdc++.h>
using namespace std;
typedef int64_t ll;
template <typename tp>
void show(vector<tp> v){
    for(ll i=0;i<v.size()-1;i++) cout<<v[i]<<" ";
    cout<<v[v.size()-1]<<endl;
}

int main(){
    ll n;
    cin>>n;
    vector<ll> x(n);
    for(ll i=0;i<n;i++) cin>>x[i];
    vector<ll> diff(n-1);
    sort(x.begin(),x.end());
    for(ll i=0;i<n-1;i++) diff[i]=x[i+1]-x[i];
    ll ans=pow(10,9);
    for(ll i=0;i<n-1;i++) if(ans>diff[i]&&diff[i]!=0) ans=diff[i];
    cout<<ans<<endl;
}