package suwl;
import java.util.Arrays;
import java.math.MathContext; 
import java.util.Scanner;
class Rational{
	private int v1 ;//苏志颖
	private int v2 ;//学号：201621123081（实在想不到在哪里还能添加这些东西，就只好用注释来加了）
	public int getV1(){
		return this.v1 ;
	}
	public int getV2(){
		return this.v2 ;
	}
	Rational(){}//这是一个无参构造
	Rational(int v1, int v2){
		this.v1 = v1 ;
		this.v2 = v2 ;
	}
	public Rational Add(Rational r1,Rational r2)//有理数相加
	{
		Rational rational = new Rational() ;
		int t ;
		rational.v2 = r1.v2 * r2.v2 ;
		rational.v1 = r1.v1 * r2.v2 + r2.v1 * r1.v2 ;
		t = Gcd(rational.v2,rational.v1) ;
		rational.v2 /= t ;
		rational.v1 /= t ;
		return rational ;
	}
	public Rational Multiply(Rational r1, Rational r2)//有理数相乘
	{
		int t ;
		Rational rational = new Rational() ;
		rational.v2 = r1.v2 * r2.v2 ;
		rational.v1 = r1.v1 * r2.v2 ;
		t = Gcd(rational.v2 , rational.v1) ;
		rational.v2 /= t ;
		rational.v1 /= t ;
		return rational ;
	}
	public int getInfo(int i)
	{
		if(i == 1)
			return this.v1 ;
		else
			return this.v2 ;
	}
	public int Gcd(int m , int n)//求两数最大公约数
	{
		int t;
		while(m % n != 0)
		{
			t = n;
			n = m % n;
			m = t;
		}
		return n;
	}
}
public class Practice {
	public static void main(String[] args) {
		int i ;
		//Rational r3 = new Rational() ;
		Scanner sc = new Scanner(System.in) ;
		Rational r1 = new Rational(sc.nextInt(),sc.nextInt()) ;
		Rational r2 = new Rational(sc.nextInt(),sc.nextInt()) ;
		//r3 = new Rational().Add(r1,r2);
		System.out.println(new Rational().Add(r1,r2).getV1() + " " + new Rational().Add(r1,r2).getV2());
		System.out.println(new Rational().Multiply(r1, r2).getV1()+" "+ new Rational().Multiply(r1, r2).getV2());
		System.out.print("接下来要输入一个整数i来选择输出有理数r1的分子或者分母，数字i为（0，1）= ");
		System.out.println(r1.getInfo(sc.nextInt()));
		sc.close();;
	}	
}