Problem:
Set Difference

Find the difference of two sets $A = \{a_0, a_1, ..., a_{n-1}\}$ and $B = \{b_0, b_1, ..., b_{m-1}\}$, $A - B$.

Input

The input is given in the following format.

$n$
$a_0 \; a_1 \; ... \; a_{n-1}$
$m$
$b_0 \; b_1 \; ... \; b_{m-1}$

Elements in $A$ and $B$ are given in ascending order. There are no duplicate elements in each set.

Output

Print elements in the difference in ascending order. Print an element in a line.

Constraints

$1 \leq n, m \leq 200,000$

$0 \leq a_0 < a_1 < ... < a_{n-1} \leq 10^9$

$0 \leq b_0 < b_1 < ... < b_{m-1} \leq 10^9$

Sample Input 1

5
1 2 3 5 8
2
2 5

Sample Output 1

1
3
8

Solution in JAVA (judge verdict: Accepted)


import java.util.Scanner;
import java.util.TreeSet;

public class Main {
	public static void main(String[] args){
		int i, n, m, a, b;
		TreeSet<Integer> setA = new TreeSet<Integer>();
		TreeSet<Integer> setB = new TreeSet<Integer>();
		try (Scanner sc = new Scanner(System.in)) {
			n = sc.nextInt();
			for(i = 0; i < n; i++) {
				a = sc.nextInt();
				setA.add(a);
			}
			m = sc.nextInt();
			for(i = 0; i < m; i++) {
				b = sc.nextInt();
				setB.add(b);
			}
			setA.removeAll(setB);
			for(int output : setA) {
				System.out.println(output);
			}
		}
	}
}