#include <iostream>

using namespace std;

struct rational
{ int top, bot; };

void normalise(rational & r)
{ int a = r.top, b = r.bot;
  if (b < 0)
  { a = -a;
    b = -b; }
  while (b != 0)
  { int temp = a % b;
    a = b;
    b = temp; }
  r.top /= a;
  r.bot /= a; }

rational fraction(int t, int b)
{ rational r;
  r.top = t;
  r.bot = b;
  normalise(r);
  return r; }

rational number(int n)
{ rational r;
  r.top = n;
  r.bot = 1;
  return r; }

const int stack_max = 1000;

struct stack_of_rationals
{ rational data[stack_max];
  int top; };

void initialise(stack_of_rationals & S)
{ S.top = 0; }

void push(stack_of_rationals & S, rational x)
{ if (S.top >= stack_max)
  { cout << "Error! stack full\n";
    return; }
  S.data[S.top] = x;
  S.top += 1; }

bool isempty(stack_of_rationals & S)
{ return S.top == 0; }

rational pop(stack_of_rationals & S)
{ if (S.top <= 0)
  { cout << "Error! stack empty\n";
    return fraction(0, 1); }
  S.top -= 1;
  return S.data[S.top]; }

rational read_rational()
{ int t, b;
  char c;
  cin >> t;
  c = cin.get();
  if (c == '/')
  { cin >> b;
    return fraction(t, b); }
  else
    return fraction(t, 1); }

void print(rational r)
{ if (r.bot == 1)
    cout << r.top;
  else
    cout << r.top << "/" << r.bot; }

rational add(rational a, rational b)
{ return fraction(a.top*b.bot + b.top*a.bot, a.bot*b.bot); }

rational sub(rational a, rational b)
{ return fraction(a.top*b.bot - b.top*a.bot, a.bot*b.bot); }

rational mul(rational a, rational b)
{ return fraction(a.top*b.top, a.bot*b.bot); }

rational div(rational a, rational b)
{ return fraction(a.top*b.bot, a.bot*b.top); }

void check(rational b, rational e, string sign, rational operation(rational, rational))
{ print(b);
  cout << " " << sign << " ";
  print(e);
  cout << " = ";
  print(operation(b, e));
  cout << "\n"; }

int main()
{ stack_of_rationals S;
  initialise(S);
  while (true)
  { char c = cin.get();
    if (c=='\n' || c==' ')
    { }
    else if (c>='0' && c<='9')
    { cin.unget();
      rational r = read_rational();
      cout << " = ";
      print(r);
      cout << "\n";
      push(S, r); }
    else
    { rational b = pop(S);
      rational a = pop(S);
      print(a);
      cout << " " << c << " ";
      print(b);
      if (c == '+')
        a = add(a, b);
      else if (c == '-')
        a = sub(a, b);
      else if (c == '*')
        a = mul(a, b);
      else if (c == '/')
        a = div(a, b);
      else
        cout << "Error '" << c << "' not an operator\n"; 
      cout << " = ";
      print(a);
      cout << "\n";
      push(S, a); } } }