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

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] data = new int[n];
        for(int a_i=0; a_i < n; a_i++){
            data[a_i] = in.nextInt();
            
        }
        Arrays.sort(data);
        int diff = Math.abs(data[0] - data[1]);
        for (int i = 1; i < n - 1; i++) {
            int d = Math.abs(data[i] - data[i+1]);
            if (d < diff) diff = d;
        }
        System.out.println(diff);
    }
}