package m.shin;
import java.util.Scanner;
import java.util.TreeSet;
public class Con135 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int N = s.nextInt();
		TreeSet<Integer> x = new TreeSet<>();
		for(int i = 0;i < N;i++){
			x.add(s.nextInt());
		}
		s.close();

		int from = x.pollFirst() , to = 0;
		if(x.size() == 0){
			System.out.println("0");
		}else{
			int dmin = Math.abs(x.last() - from) , size = x.size();
			for(int i = 0;i < size;i++){
				to = x.pollFirst();
				if(dmin > Math.abs(to - from)){
					dmin = Math.abs(to - from);
				}
				from = to;
			}
			System.out.println(dmin);
		}
	}

}