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

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false); 

    int n;
    cin>>n;
    vector<ll> a(n);
    for(int i = 0;i<n;i++) cin>>a[i];
    sort(a.begin(),a.end());
    a.erase(unique(a.begin(),a.end()),a.end());
    n = a.size();
    if(n==1) cout<<0<<endl;
    else{
        ll ans = 1e9;
        for(int i = 0;i+1<n;i++) ans = min(ans,a[i+1]-a[i]);
        cout<<ans<<endl;
    }
}