import java.math.*;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] num = new int[n];
        for(int i=0;i<n;i++){
        	num[i]=sc.nextInt();
        }
        Arrays.sort(num);
        int ans=9999999;
        for(int i=0;i<=n-2;i++){
        	if(num[i+1]-num[i]==0)continue;
        	ans=Math.min(ans, num[i+1]-num[i]);
        }
        if(ans==9999999){
        	System.out.println(0);
        }else
        System.out.println(ans);
    }
}