#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll=vector<long long>;
template<typename T>
T get(){T r;cin>>r;return r;}

int main() {
    ll n=get<ll>();
    vll x;
    ll mn;
    for(ll i=0;i!=n;i++) x.push_back(get<ll>());
    sort(x.begin(),x.end());
    mn=*(x.end()-1);
    for(ll i=0;i!=n-1;i++){
        if(mn>x[i+1]-x[i]){
            mn=x[i+1]-x[i];
        }
    }
    cout<<mn<<endl;
    

    system("pause");
}