Strip first X chars from all files batch

@echo off
setlocal enabledelayedexpansion
color 0b
set /p FOLDER_PATH=Drag the folder into here: 
:begin
set /p X=How many chars do you want to chop off the beginning? 
set /p NEW_PREFIX=What would you like to put infront instead? 
pushd %FOLDER_PATH%
for %%f in (*) do if %%f neq %~nx0 (
    set "filename=%%~nf"
    set "filename=!filename:~%X%!"
    echo "%NEW_PREFIX%!filename!%%~xf"
)
popd
echo.
set /p YORN=Is that what you want(Y/N)? 
if /i "%YORN%" NEQ "Y" goto begin
pushd %FOLDER_PATH%
for %%f in (*) do if %%f neq %~nx0 (
    set "filename=%%~nf"
    set "filename=!filename:~%X%!"
    ren "%%f" "%NEW_PREFIX%!filename!%%~xf"
)
popd