import java.util.Scanner;

class Y135{
    public static void main(String arg[]){
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int[] x=new int[n];
        for(int i=0;i<n;i++){
            x[i]=sc.nextInt();
        }
        int min=2000000000;
        for(int i=0;i<n;i++){
            for(int j=0;j<n;j++){
                if(Math.abs(x[i]-x[j])!=0){
                    min=Math.abs(x[i]-x[j]);
                }
            }
        }
        System.out.println(min);
    }
}