terse

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in (A.txt) do (
    set str=%%i
    set Ln=&set "Sn=!str!"
    for %%j in (4096 2048 1024 512 256 128 64 32 16)do if "!Sn:~%%j!" NEQ "" set/aLn+=%%j&set Sn=!Sn:~%%j!
    set Sn=!Sn!FEDCBA9876543210&set/aLn+=0x!Sn:~16,1!
    for /l %%j in (0 2 !Ln!) do (
        set /a "D=0x!str:~%%j,2!"
        set var=!var!!D!
    )
    echo !var!&set "var="
)
pause
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