@echo off
setlocal ENABLEDELAYEDEXPANSION
(for /f "delims=" %%a in (b.txt) do (
  set /a n+=1
  set #!n!=%%a
)
set n=
for /f "delims=" %%a in (a.txt) do (
  set str=%%a
  if "!str:~-4!"=="****" (
    set /a n+=1
    call echo.%%#!n!%%
  ) else (
    echo.%%a
  )
))>c.txt
pause
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