@echo off
set /p str=enter the selected number:
:STR_VISTOR
echo str = %str%
for /f tokens=1,* %%a in (%str%) do (
set /a a=%%a
set str=%%b 
if %a% GTR 4 (
echo nonscript
) else (
echo script%a%
goto script%a%
)
)
:script1
echo 1
goto STR_VISTOR
:script2
echo 2
goto STR_VISTOR
: script3
echo 3
goto STR_VISTOR
:script4
echo 4
goto STR_VISTOR
:nonscript
echo invalid number %%a
goto STR_VISTOR
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