I just made this.
You gotta make a branch node, with the condition of A < B, then each run of the branch TRUE you add 1 to A and loop back to the branch. Then the FALSE on the branch goes to the rest of your code you want to run when the loop stuff is finished.
Basically, A counts up until it reaches B, once A = B the A< B condition is FALSE and you exit the loop. Make A a variable so you can add 1 to it before looping back to the branch each time.
Check everything before you compile and BACKUP YOUR WORK. These loops can get dangerous fast if you make a mistake (like doing A-1 instead of A+1 lol, compile won’t catch this as a problem but it definatly is!).