Do {
    $Input = Read-Host -Prompt 'Enter username (4 symbols without spaces):'
} While ($Input.length -ne 4 -And -Not ($Input -Match ' '))

New-LocalGroup -Name "GPart3$Input"
New-LocalUser -Name "UPart3$Input" -NoPassword
Add-LocalGroupMember -Group "GPart3$Input" -Member "UPart3$Input"
Add-LocalGroupMember -Group "Пользователи" -Member "UPart3$Input"
Enable-LocalUser -Name "UPart3$Input"