import java.util.*;
import java.math.*;
import java.io.*;

public class Main {
	public static void main(String[] args) {
		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();
		}
		for(int i = 0; i < N; i++) {
			int idx1 = (int)Math.random() * N;
			int idx2 = (int)Math.random() * N;
			int tmp = x[idx1];
			x[idx1] = x[idx2];
			x[idx2] = tmp;
		}
		if(N == 1) System.out.println("0");
		int MIN = Integer.MAX_VALUE;
		
		Arrays.sort(x);
		for(int i = 0; i < N-1; i++) {
			if(x[i] == x[i+1]) continue;
			MIN = Math.min(MIN, (int)Math.abs(x[i] - x[i+1]));
		}
		if(MIN == Integer.MAX_VALUE) MIN = 0;
		System.out.println(MIN);
	}
}