import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;

public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		Set<Integer> set = new TreeSet<Integer>();
		int n = sc.nextInt(), a = -1000000, min = 1000001;
		for(int i = 0; i < n; i++){
			set.add(sc.nextInt());
		}
		if(set.size() == 1){
			System.out.println(0);
			return;
		}
		for(int i : set){
			min = Math.min(min, i-a);
			a = i;
		}
		System.out.println(min);
	}
}