include iostream using namespace std class fraction private long long

#include<iostream>
using namespace std;
class fraction{
private:
    long long int a,b;
public:
    fraction(long long int a = 0, long long int b = 1)
    {
        this->a = a;
        this->b = b;
    }
    void show()
    {
        cout << a << '/' << b;
    }
    void read()
    {
        char c;
        cin >> a >> c >> b;
    }
    fraction operator*(fraction other){
        return fraction(a *  other.a, b * other.b);
    }
    fraction operator+(fraction other){
        return fraction(b *  other.a + a * other.b, b * other.b);
    }
    fraction operator-(fraction other){
        return fraction(a *  other.b - b * other.a, b * other.b);
    }
};
int main(){
    fraction x,y;
    x.read();
    y.read();
    (x * y).show();
    return 0;
}