import java.util.*;
import java.io.*;
public class Main {
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        int array[] = new int[n];
        StringTokenizer st = new StringTokenizer(br.readLine());
        for(int i = 0;i < n;i++){
            array[i] = Integer.parseInt(st.nextToken());
        }
        Arrays.sort(array);
        int ans = Integer.MAX_VALUE;
        for(int i = 1;i < n;i++){
            ans = Math.min(ans,Math.abs(array[i] - array[i - 1]));
        }
        System.out.print(ans);

    }
}