import java.util.Arrays;
import java.util.Scanner;

public class Solution {

    public static void main(String arg[]) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int vet[] = new int[n];
        for(int i = 0; i < n; i++) {
            vet[i] = in.nextInt();
        }
        Arrays.sort(vet);
        int minDist = Integer.MAX_VALUE;
        for(int i = 0; i < n-1; i++) {
            minDist = Math.min(minDist, Math.abs(vet[i] - vet[i+1]));
        }
        System.out.println(minDist);
    }
}