Display a new entry in a column in a separate cell in excel

Hello,

I am having a column;

A B

1 ab
2 abc
3 abcd
4 abcde
5 xyz
6

I want the next entry in 6 row of A to be entered into 1 row of B and likewise any next entry in column A should be displayed in 1 row of B.

Please help me with this!

Thanks.