import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.math.BigInteger;

public class Main {
    public static void main(String[] args) throws java.lang.Exception {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));

        for (int i = 0; i < 10; i++) {
            String line = bf.readLine();
            String secondLine = bf.readLine();

            BigInteger apples = new BigInteger(line);
            BigInteger klaudiaMoreApples = new BigInteger(secondLine);

            System.out.println(apples.add(klaudiaMoreApples).divide(BigInteger.valueOf(2)));
            System.out.println(apples.subtract(klaudiaMoreApples).divide(BigInteger.valueOf(2)));
        }
    }
}