import java.util.Scanner;

public class A {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int[] a = new int[100];
		int[] b = new int[100];
		while (true) {
			int n = in.nextInt();
			int m = in.nextInt();
			if (n == 0 && m == 0)
				break;
			int suma = 0;
			int sumb = 0;
			for (int i = 0; i < n; i++) {
				a[i] = in.nextInt();
				suma += a[i];
			}
			for (int i = 0; i < m; i++) {
				b[i] = in.nextInt();
				sumb += b[i];
			}
			if ((suma + sumb) % 2 == 1) {
				System.out.println(-1);
				continue;
			}
			int target = (suma + sumb) / 2;
			int ansa = 1000;
			int ansb = 1000;
			for (int i = 0; i < n; i++) {
				for (int k = 0; k < m; k++) {
					int ta = a[i];
					int tb = b[k];
					if (suma - ta + tb == target && sumb - tb + ta == target) {
						if (ta + tb < ansa + ansb) {
							ansa = ta;
							ansb = tb;
						}
					}
				}
			}
			if (ansa == 1000)
				System.out.println(-1);
			else
				System.out.println(ansa + " " + ansb);
		}
	}

}