import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;


public class Solution
{
    public static void main(String[] args) throws Exception
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        int[] ar = Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
        int min = 10000;
        
        Arrays.sort(ar);
        
        for (int i=0; i<ar.length-1; i++)
        {
            int v = ar[i+1] - ar[i];
            
            if (v < min)
                min = v;
        }
        
        System.out.println(min);
    }
}