#include <iostream>

using namespace std;

int gcd(int a, int b)
{ for (int pd = min(a, b); pd > 1; pd -= 1)
    if (a % pd == 0 && b % pd == 0)
      return pd;
  return 1; }

struct rational
{ int top, bot;

  void simplify()
  { if (top == 0)
    { bot = 1;
      return; }
    int d = gcd(top, bot);
    if (d != 1)
    { top /= d;
      bot /= d; }
    if (bot < 0)
    { bot = - bot;
      top = - top; } }

  rational(int t, int b)
  { top = t;
    bot = b;
    simplify(); }

  void print()
  { if (top < 0)
    { cout << "-";
      top = - top; }
    if (bot == 1)
      cout << top;
    else if (top > bot)
    { int whole = top / bot;
      int newtop = top - whole * bot;
      cout << whole << "+" << newtop << "/" << bot; }
    else
      cout << top << "/" << bot; }

  rational multiply(rational b)
  { rational r(r.top = top * b.top, r.bot = bot * b.bot);
    return r; }

  rational divide(rational b)
  { rational r(r.top = top * b.bot, r.bot = bot * b.top);
    return r; }

  rational add(rational b)
  { rational r(r.top = top * b.bot + b.top * bot, r.bot = bot * b.bot);
    return r; }

  rational subtract(rational b)
  { rational r(top * b.bot - b.top * bot, r.bot = bot * b.bot);
    return r; } };

void one_test(string s, rational a, rational b, rational c)
{ a.print();
  cout << " " << s << " ";
  b.print();
  cout << " is ";
  c.print();
  cout << "\n"; }

void test(rational a, rational b)
{ one_test("plus", a, b, a.add(b));
  one_test("minus", a, b, a.subtract(b));
  one_test("times", a, b, a.multiply(b));
  one_test("divided by", a, b, a.divide(b)); }

rational ask(string prompt)
{ int t, b;
  cout << prompt << ", top then bottom: ";
  cin >> t >> b;
  return rational(t, b); }

int main()
{ while (true)
  { rational a = ask("A");
    rational b = ask("B");
    test(a, b); } }