@echo off
cd /d "%~dp0"
set "KeyStr=input"
(for /f "tokens=1* delims=:" %%a in ('findstr /n .* "b.txt"') do (
    set "ThisStr=%%b"
    setlocal enabledelayedexpansion
    echo,!ThisStr!
    if "!ThisStr!" equ "%KeyStr%" (
        type "a.txt"
    )
    endlocal
))>"c.txt"
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@echo off
setlocal enabledelayedexpansion
for /f "delims=" %%i in (a.txt) do (
    set /a n+=1
    set _!n!=%%i
)
(for /f "tokens=1* delims=:" %%i in ('findstr /n .* b.txt') do (
    echo,%%j
    if "%%j"=="input" (
        set /a m+=1
        for %%k in (_!m!) do echo,!%%k!
    )
))>c.txt
pause
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powershell -noprofile -executionpolicy bypass "(gc b.txt) -replace '(?<=^input)',\"`r`n$(gc a.txt -raw)\"" >c.txt
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