Suppose I have this textfile A:

League 1:

a = 123456, b = england

a = 234564, b = brazil

a = 939311, b = germany

...

League 2:

a= 213213, b = italy

...

...

League 500:

a = 74778, b = denmark

...

-----------------------------------------------------

Now, I have another textfile B:

League 1:

trash

trash

trash

a = 123456

a = 234567

a = 939311

...

League 2:

trash

trash

...

a = 312311

a = 987324

...

...

League 500:

trash

trash

...

a = 238483

a = 243234

...

NOW, can someone please help me to convert a list of "a =" in each League from textfile B into a list of corresponding "b ="? Any ideas/ suggestions? Thanks in advance!