#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef string str;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    ll n;
    cin >> n;
    ll temp, nmin = LONG_MAX;
    for (ll i = 0; i < n; i++)
    {
        ll x;
        cin >> x;
        if (i == 0) temp = x;
        else
        {
            if (temp == x) nmin = min(nmin, 1LL);
            else nmin = min(nmin, max(temp, x) - min(temp, x));
            temp = x;
        }
    }
    cout << nmin;
    return 0;
}