import java.util.Scanner;
import java.util.Arrays;
public class Dim1{
	public static void main(String[] arg){
		Scanner sc = new Scanner(System.in);
		int n,res=100001;
		n = sc.nextInt();
		int[] a = new int[n];
		for(int i = 0;i<n;i++){
			a[i] = Integer.parseInt(sc.next());
		}
		Arrays.sort(a);
		if(a.length>1){
			if(a[0] != a[1])res = Math.abs(a[0] - a[1]);
			for(int i =0;i<n-1;i++){
				if(a[i] != a[i+1]){
					if(Math.abs(a[i] - a[i+1]) < res)res = Math.abs(a[i] - a[i+1]);
				}
			}
		}
		if(res == 100001)res = 0;
		System.out.println(res);
	}
}