#include <bits/stdc++.h>
using namespace std;
#define sp " "
#define endl "\n"
#define fileio() freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#define fastio() cin.tie(0), ios_base::sync_with_stdio(0)
#define pb push_back
#define pii pair<int, int>
#define st first
#define nd second
#define N 200005
int arr[N];
const int INF = 2e9 + 7;
int32_t main(){
#ifndef ONLINE_JUDGE
//fileio();
#endif
fastio();
int n;
cin>>n;
int ans = INF;
for (int i = 1; i <= n; i++){
cin>>arr[i];
if (i > 1) ans = min(ans, abs(arr[i] - arr[i - 1]));
}
cout<<ans<<endl;
cerr<<"time taken : "<<(float)clock() / CLOCKS_PER_SEC<<" seconds\n";
}
