cobat

@echo off&setlocal enabledelayedexpansion
set /p n1=user insert num1:
set /p n2=user insert num2:
:loop
for /l %%a in (1,1,%n1%) do set "s=!s!%%a"
if "!s:~%n2%!" equ "" goto :loop
for /l %%a in (1,1,%n2%) do echo !s:~,%%a!
set/a n2-=1&for /l %%a in (!n2!,-1,1) do echo !s:~,%%a!
pause
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