#include <iostream>

using namespace std;

class Fraction {
private:
    long long int x;
    long long int y;
public:
    Fraction(long long int x = 0, long long int y = 1) {
        this->x = x;
        this->y = y;
    }
    void show() {
        cout << x << "/" << y << endl;
    }
    Fraction operator + (const Fraction & f) {
        long long int a, b;
        a = this->x*f.y + this->y*f.x;
        b = this->y*f.y;
        return Fraction(a, b);
    }
    void read() {
        char a;
        cin >> x >> a >> y;
    }
};
int main() {
    Fraction a, b, c;
    a.read();
    b.read();
    c = a + b;
    c.show();
    system("pause");
    return 0;
}