import java.util.Arrays;
import java.util.Scanner;


// ********************** @author Shashwat-PC NIET College*****************
public class Compound {

    public static void main(String[] args) {
        
          Long[] a = new Long[100000];
            int n,i;
        Scanner s=new Scanner(System.in);
        n=s.nextInt();
        for(i=0;i<n;i++)
            a[i]=s.nextLong();
        Arrays.sort(a,0,n-1);
long minDiff = Math.abs(a[1]-a[0]);
for (i = 2 ; i != n; i++) {
    minDiff = Math.min(minDiff, Math.abs(a[i]-a[i-1]) );
}
System.out.println(minDiff);
    }
    
}