#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>

using namespace std;


int main() {


    int N;
    cin >> N;
    vector<int> xs;
    for (int i = 0; i < N; ++i) {
        int X;
        cin >> X;
        xs.push_back(X);
    }

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

    int m = 1000000;


    bool found = false;
    for (int i = 1; i < N; ++i) {
        if (xs[i] == xs[i - 1]) {
            continue;
        } else {
            m = min(m, xs[i] - xs[i - 1]);
            found = true;
        }
    }

    if (found) {
        cout << m << endl;
    } else {
        cout << 0 << endl;
    }


    return 0;

}