Solve the following system for real $a , b, c, d, e$: \[ \left\{ \begin{array}{ccc} 3a & = & ( b + c+ d)^3 \\ 3b & = & ( c + d +e ) ^3 \\ 3c & = & ( d + e +a )^3 \\ 3d & = & ( e + a +b )^3 \\ 3e &=& ( a + b +c)^3. \end{array}\right.  \]
1. **Assume without loss of generality that \(a\) is the greatest among the five given numbers.** 
   - This implies \(a \geq b, c, d, e\).

2. **Consider the equation \(3a = (b + c + d)^3\).**
   - Since \(a\) is the greatest, we have \(d + e + a \geq c + d + e\).
   - Therefore, \(c = \frac{(d + e + a)^3}{3} \geq \frac{(c + d + e)^3}{3} = b\).

3. **Consider the equation \(3e = (a + b + c)^3\).**
   - Since \(a\) is the greatest, we have \(e = \frac{(a + b + c)^3}{3} \geq \frac{(b + c + d)^3}{3} = a\).
   - Given \(a \geq e\), we conclude \(a = e\).

4. **Since \(a = e\), we also have \(e \geq b\).**
   - From the equation \(3b = (c + d + e)^3\), we get \(b = \frac{(c + d + e)^3}{3} \geq \frac{(b + c + d)^3}{3} = a\).
   - Given \(a \geq b\), we conclude \(a = b\).

5. **Since \(a = b\), we also have \(c \geq b\).**
   - From the equation \(3c = (d + e + a)^3\), we get \(c = \frac{(d + e + a)^3}{3} \geq \frac{(c + d + e)^3}{3} = b\).
   - Given \(a \geq c\), we conclude \(a = c\).

6. **Since \(a = c\), we also have \(d \geq c\).**
   - From the equation \(3d = (e + a + b)^3\), we get \(d = \frac{(e + a + b)^3}{3} \geq \frac{(d + e + a)^3}{3} = c\).
   - Given \(a \geq d\), we conclude \(a = d\).

7. **Since \(a = d\), we also have \(a = e\).**
   - From the equation \(3e = (a + b + c)^3\), we get \(e = \frac{(a + b + c)^3}{3} \geq \frac{(e + a + b)^3}{3} = d\).
   - Given \(a \geq e\), we conclude \(a = e\).

8. **Since \(a = b = c = d = e\), we need to solve \(3a = (3a)^3\).**
   - This simplifies to \(3a = 27a^3\).
   - Dividing both sides by \(3a\) (assuming \(a \neq 0\)), we get \(1 = 9a^2\).
   - Solving for \(a\), we get \(a^2 = \frac{1}{9}\), hence \(a = \frac{1}{3}\) or \(a = -\frac{1}{3}\).

9. **Considering the case \(a = 0\):**
   - If \(a = 0\), then \(b = c = d = e = 0\).

10. **Thus, the solutions are:**
    - \((a, b, c, d, e) = \left(\frac{1}{3}, \frac{1}{3}, \frac{1}{3}, \frac{1}{3}, \frac{1}{3}\right)\)
    - \((a, b, c, d, e) = (0, 0, 0, 0, 0)\)
    - \((a, b, c, d, e) = \left(-\frac{1}{3}, -\frac{1}{3}, -\frac{1}{3}, -\frac{1}{3}, -\frac{1}{3}\right)\)

The final answer is \( \boxed{ \left(\frac{1}{3}, \frac{1}{3}, \frac{1}{3}, \frac{1}{3}, \frac{1}{3}\right) } \), \((0, 0, 0, 0, 0)\), and \(\left(-\frac{1}{3}, -\frac{1}{3}, -\frac{1}{3}, -\frac{1}{3}, -\frac{1}{3}\right)\).