package yukicoder;

import java.util.Scanner;

public class Yuki135 {
	
	public static void main(String[] args ) {
		
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		int x[] = new int[n];
		
		for(int i = 0; i < n; i++) {
			x[i] = scan.nextInt();
		}
		scan.close();
		
		int ans = 0;
		int perseAns = 0;
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < n; j++) {
				
				if( x[i] > x[j] ){
					ans = x[i]-x[j];
				} else {
					ans = x[j]-x[i];
				}
				
				if(perseAns == 0) {
					perseAns = ans;
				}else if ( ans < perseAns && ans != 0) {
					perseAns = ans;
				}				
			}
		}
		System.out.println(perseAns);
		
	}
}