#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int length = 0;

    cin >> length;
    const int len = length;
    int diff = 0;
    int arr[len] = {};
    int minValue = INT_MAX;

    for(int i = 0; i < len; i ++){
        cin >> arr[i];
    }

    for(int j = 0; j < len; j++){
        for(int k =j + 1; k < len; k ++){
            diff = abs(arr[j] - arr[k]);
            if(diff <= minValue){
                minValue = diff;
            }
        }
    }
            cout << minValue << endl;
    return 0;
}