Qucick Help Needed COUNT Curly braces in string

Question

Hi

 

i will get one string, in that string i have to count pair of curly braces. bellow is an example of data .

 

please give me solutions for this .

 

{}, score of 1.

{{{}}}, score of 1 + 2 + 3 = 6.

{{},{}}, score of 1 + 2 + 2 = 5.

{{{},{},{{}}}}, score of 1 + 2 + 3 + 3 + 3 + 4 = 16.

{<a>,<a>,<a>,<a>}, score of 1.

{{<ab>},{<ab>},{<ab>},{<ab>}}, score of 1 + 2 + 2 + 2 + 2 = 9.

{{<!!>},{<!!>},{<!!>},{<!!>}}, score of 1 + 2 + 2 + 2 + 2 = 9.

{{<a!>},{<a!>},{<a!>},{<ab>}}, score of 1 + 2 = 3.