#include <bits/stdc++.h>
#define ll long long
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
#define pii pair<int, int>
#define FF first.first
#define FS first.second
#define pb push_back
using namespace std;
const ll N=1000006, INF=1e18, P=998244353;
ll q=1, n, m, x, y, z, l, r, k, a[N], b[N], f[N], ansl, ansr, ans, o, u, Ans[N];
vector <pii> v[N], V;
string s,t;
char c;
main(){ios_base::sync_with_stdio(false), cin.tie(0);
//cin>>q;
while(q--){k=ans=ansl=ansr=0;o=0;
cin>>n;
ans=INF;
for (int i=1; i<=n; i++){
cin>>a[i];
if(i==1)continue;
ans=min(ans, abs(a[i]-a[i-1]));
}
cout<<ans;
}
}
