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[] a = new int[n];
        for(int a_i=0; a_i < n; a_i++){
            a[a_i] = in.nextInt();
        }
        Arrays.sort(a);
        int minAbsVal = Math.abs(a[0] - a[1]);
        for (int i = 1; i < n - 1; i++) {
            int newAbsVal = Math.abs(a[i] - a[i + 1]);
            if (newAbsVal < minAbsVal) {
                minAbsVal = newAbsVal;
            }
        }
        System.out.println(minAbsVal);
    }
}