https://www.acmicpc.net/problem/10871
import java.util.*;
class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int N = sc.nextInt();
int X = sc.nextInt();
int arr[] = new int[N];
for (int i = 0; i < N; i++) {
arr[i] = sc.nextInt();
}
for (int i = 0; i < N; i++) {
if (arr[i] < X)
System.out.printf("%d ", arr[i]);
}
sc.close();
}
}