@echo off&setlocal enabledelayedexpansion
for /f %%a in (a.txt) do (
    set "str=%%a"
    for /f "tokens=1* delims=0" %%a in ("a!str!") do (
        set "b=%%b"
        if defined a (
           set /a num=b-a
           if !num! neq 1 echo !var!
        )
    )
    set /a a=b&set "var=!str!"
)
pause>nul
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@echo off&set a=-1
for /f %%a in (a.txt) do call:a %%a
pause&exit
:a
set/aa+=1
set b=000000000000000%a%
if "%1"=="%b:~-16%" (set c=%1) else (
    if defined c set c=&echo;%c%
    goto:a
)
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