#include <iostream>
#include <algorithm>

using namespace std;
const int N = 1010;
int a[N];
int n;

int main(){
    cin >> n;
    for(int i = 0;i < n;i++) cin >> a[i];

    sort(a,a + n);
    int ans = a[0],res = 0x3f3f3f3f;
    for(int i = 1;i < n;i++){
        res = min(res,abs(ans - a[i]));
        ans = a[i];
    }
    cout << res << endl;

    return 0;
}