Using Multyline TextBox

I created in UMG 3 simple Multyline Text Box. I need to get text from evry line of 1st and 2nd Multyline and append in the 3rd.

For example: My input was:
1st Multyline Text
A
B

2nd Multyline Text
C
D

I need in output
3rd Multyline Text
AC
BD