//Bai 21
 
#include<bits/stdc++.h>
using namespace std;
#define el "\n"
#define ll long long
#define ull unsigned long long
#define se second
#define fi first
#define be begin()
#define en end()
#define Faster cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
int n;
void Run()
{
    cin >> n;
    ll a[n];
    for(auto &x : a) cin >> x;
    sort(a, a + n);
    ll ans = abs(a[1] - a[0]);
    for(int i = 2; i < n; i++) ans = min(ans, a[i] - a[i - 1]);
    cout << ans;
}
int main()
{
    Faster;
    Run();
    return 0;
}
 
 

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