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();
        List<Integer> a = new ArrayList<>();
        for(int a_i=0; a_i < n; a_i++){
            a.add(in.nextInt());
        }
        a.sort(Comparator.naturalOrder());
        int min = Integer.MAX_VALUE;
        
        for(int i = 0; i < a.size()-1; i++) {
        	int abs = Math.abs(a.get(i) - a.get(i+1));
        	if (abs < min) {
        		min = abs;
        	}
        }
        System.out.println(min);
    }
}