import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        int index=10000;
        int n;

        Scanner s = new Scanner(System.in);
        n = s.nextInt();
        int[] value = new int[n];

        for(int i=0; i<n; i++){
            value[i] = s.nextInt();
        }

        for(int i=0; i<n; i++){
            for(int j=i+1; j<n; j++){
                if(Math.abs(value[i]-value[j]) < index){
                    index = Math.abs(value[i]-value[j]);
                }
            }
        }
        System.out.printf("%d",index);
    }
}