Convert List into Tree with n levels

We have a list that contains n levels of items separated by dots.We have to arrange them in a tree,example:

A.B.C.D.a.
A.B.C.D.b.
A.B.C.D.b.1.
A.B.C.D.b.2.
AB.B.C.D.a.
AB.B.C.D.b.
AB.B.C.D.c.
AB.B.C.D.e.

Result expected in following format :

Level       1   2   3   4  5  6
            A   B   C   D  a    
                           b  1
                           b  2
           AB   B   C   D  a    
                        D  b    
                        D  c    
                        D  e