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) {
        Comparator<Integer> c = new Comparator<Integer>() {

			@Override
			public int compare(Integer o1, Integer o2) {
				if(o1.intValue() < o2.intValue())
					return -1;
				else if(o1.intValue() == o2.intValue())
					return 0;
				else 
					return 1;
			}
		};
		
		Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        ArrayList<Integer> list = new ArrayList<Integer>();
        for(int a_i=0; a_i < n; a_i++){
            int t = in.nextInt();
            list.add(t);
        }
        list.sort(c);
        int mindif = Integer.MAX_VALUE;
        for(int i = 0; i<n-1; i++){
            int dif = list.get(i) - list.get(i+1);
            if(dif<0)
            	dif*=-1;
            if(mindif>dif)
            	mindif = dif;
        }
        System.out.println(mindif);
    }
}