#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <climits>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n; cin >> n;
    vector<int> arr(n);
    for(int i =0; i<n; ++i)
        cin >> arr[i];
    sort(arr.begin(), arr.end());
    int mini=INT_MAX;
    for(int i =1; i<n; ++i)
        mini = min (mini, abs(arr[i]-arr[i-1]));
    cout << mini << endl;
    return 0;
}