#include "bits/stdc++.h"
using namespace std;

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

    sort(x.begin(), x.end());

    int m = 999999;
    for (int j = 0; j < x.size()-1; ++j) {
        if (x[j+1] - x[j] != 0) {
            m = min(m, x[j+1] - x[j]);
        }
    }
    if (m == 999999) {
        cout<<0<<endl;
    } else{
        cout<<m<<endl;
    }


    return 0;
}