Get nth number of sets from user in proper set format in C#

I think you still not got my point. okay once again i explain you what i want.

• User Enter set in WPF window in this format e.g {1,2,3,ab},{ab,cd,1,2}.


• User can enter nth number of set.


• User can enter nth number of elements\ items in each set.


• Count the number of elements in each set.

Hopefully now you got my point