#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define F first
#define S second
#define coy cout<<"YES\n"
#define con cout<<"NO\n"
#define co1 cout<<"-1\n"
#define sc(x) scanf("%lld",&x)
#define all(x) x.begin(),x.end()
#define fast ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
using namespace std;
const int SI=3e5+7;
ll INF=8e18+7;
int dx[] = {1 , -1 , 0 , 0};
int dy[] = {0 , 0 , 1 , -1};
int MOD=1e9+7;
ll ans=INF;
ll n,a[SI];
int main()
{
fast
cin>>n;
for (int i=0;i<n;i++)
cin>>a[i];
for (int i=1;i<n;i++)
ans=min(ans,abs(a[i]-a[i-1]));
cout <<ans <<"\n";
// use scanf not cin
return 0;
}
