#include <bits/stdc++.h>

using namespace std;

#define mt make_tuple
#define mp make_pair
#define pb push_back
#define all(x) x.begin(),x.end()

typedef long long ll;
typedef pair<int,int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<vi> vvi;

int main() {
    int n;
    cin >> n;
    vi a(n);
    for( auto& i : a)
        cin >> i;
    sort(all(a));
    int mi = a[n-1]-a[0];
    for(int i = 0 ; i < n-1 ; i++){
        mi = min(mi,a[i+1]-a[i]);
    }
    cout << mi << endl;
    return 0;
}