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


public class MinAbsoluteDifference {

	public static void main(String[] args) throws Exception {
		Scanner scan = new Scanner(System.in);
		long a[] = new long[scan.nextInt()];
		for(int i= 0 ; i < a.length ;i++) {
			a[i] = scan.nextInt();
		}
		Arrays.sort(a);
		long diff = Long.MAX_VALUE;
		for(int i = 1 ; i < a.length ;i++) {
			diff = Math.min(diff, Math.abs(a[i] - a[i -1]));
		}
		System.out.println(diff);
	}
}