@echo off
(for /f "tokens=1* delims==" %%a in (a.txt) do (
    setlocal enabledelayedexpansion
    for %%i in (%%b) do (
        set n=%%i
        set /a n=n
        set _!n!=true
    )
    set /p str=%%a=<nul
    for /l %%j in (0,1,999) do (
        if not defined _%%j (
            set m=00%%j
            set m=!m:~-3!
            set /p str=!m! <nul
        )
    )
    echo,
    endlocal
))>b.txt
pause
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@echo off
(for /f "tokens=1* delims==" %%a in (a.txt) do (
    setlocal enabledelayedexpansion
    for %%i in (%%b) do (
        set n=%%i
        set /a n=n
        set _!n!=true
    )
    set /p str=%%a=<nul
    for /l %%j in (0,1,999) do (
        if not defined _%%j (
            set /p str=!m! <nul
            set m=00%%j
            set m=!m:~-3!
        )
    )
    set /p str=!m!<nul
    echo,
    endlocal
))>b.txt
pause
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@echo off
setlocal enabledelayedexpansion
for /L %%i in (1000 1 1999) do set "str=!str! %%i"
set "str=!str: 1= !"

(for /f "tokens=1* delims==" %%i in (1.txt) do (
        set "s=!str!"
        for %%k in (%%j) do set "s=!s: %%k=!"
        echo;%%i=!s:~1!
)) > 2.txt
pause
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gawk -F"[ =]+" -v BINMODE="w" "BEGIN{for(i=0;i<1000;i++)a[i]=sprintf(\"\04503d\",i)}{for(i=1;i<=NF;i++)b[$i];c=$1\"=\";for(i=0;i<1000;i++)if(!(a[i] in b))c=c a[i]\" \";sub(/ $/,\"\",c);print c;delete b}" a.txt>b.txt
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