powershell to pass yes or no response

I am using Brocade switch to run this command

Step 1. Log in to Brocade switch with root user name

Step 2.Run the below command

Brocade:root> cfgsave

Step 3. After this cmd is executed i will get below message

"You are about to save the Defined zoning configuration. This

action will only save the changes on Defined configuration.

Do you want to save the Defined zoning configuration only?  (yes, y, no, n): [no]" y_

Step 4. I need to select "yes" option.

I wrote  powershell script to run this cmd from my computer with SSH-Session module.

$d1 ="10.226.232.137"

$u1 ="test"

$p1 ="password"

$c1 = "cfgsave"

New-SshSession $d1 -Username $u1 -Password "$p1"

$Results = Invoke-Sshcommand -InvokeOnAll -Command $c1

It simply hangs there to get yes or no response.

How to pass yes or no response in powershell for above issue?