Modify Powershell script to prompt you for the email address to be blocked

I would like to modify the following script so that instead of embedding the email address that needs to be blocked, that a prompt pops up and you need to enter or paste the email address and then it proceeds to use what was input and block it.

Connect-MsolService -Credential $Credential
Connect-ExchangeOnline -UserPrincipalName admin@email.com
Set-HostedContentFilterPolicy default -BlockedSenders @{add="blockthisemail@mail.com"}
Disconnect-ExchangeOnline

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