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();
        }
        // your code goes here
        System.out.println(minimumAbsoluteDifference(a));
    }
    
    private static int minimumAbsoluteDifference(int[] a) {
        Arrays.sort(a);
        int minSoFar = Math.abs(a[0] - a[1]);
        for(int x = 1; x < a.length - 1 && minSoFar != 0; x++) {
            int currentDiff = Math.abs(a[x] - a[x + 1]);
            if(currentDiff < minSoFar) {
                minSoFar = currentDiff;
            }
        }
        return minSoFar;
    }
}