How to implement PIVOTING with dynamic no of rows ?

Question

Name	Points
A	100
B	200
C	300
A	400
B	500
C	600
A	700
B	800
C	900
……..	……
………	……..
……..	……..
……..	……..

                

Now I need to know how to get the following format output in SQL Server                                  

A	B	C	----------
100,400,700,…	200,500,800,…..	300,600,900,…..	-----------