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
        int[] absArray = getAbs(a);
        int max = getMax(absArray);
        int[] finList = new int[a.length-1];
        
        for(int x = 0; x<a.length-1; x++){
        	finList[x] = getMin(x, max, absArray);
        }
        System.out.println(getAbsMin(finList));
        
	}
	
	public static int[] getAbs(int[] array){
		int[] b = array;
        for(int j = 0; j < array.length ; j++){
        	b[j] = Math.abs(array[j]); 
        }
        return b;
	}
	
	public static int getAbsMin(int[] array){
		int min = 0;
		for(int y = 0; y < array.length - 1; y++){
        	if (array[y] < array[y+1]){
        		min = array[y];
        	}
		}
		return min;
	}	
	
	public static int getMax(int[] array){
		int max = array[0];
		for(int y = 0; y < array.length ; y++){
        	if (array[y] > max){
        		max = array[y];
        	}
		}
		return max;
	}	
	
	public static int getMin(int index, int max, int[] array){
		int min = max;
		for (int x = index; x < array.length; x++){
			int temp = array[index] - array[x];
    		if(Math.abs(temp) < min && Math.abs(temp) > 0)
    		{
    			min = Math.abs(temp);
    		}
		}
		return min;
	}
}