Question : Problem: SSH Key exchange

HI,
I have 2 machines A and B.
On A, i run a script ssh_setup.sh which will generate the keys and transfer(by ssh) keys to B.
From A, i ssh to B and then run the same script ssh_setup.sh which also resides on B.

The script generates keys on B and again ssh A to transfer the keys.
While the script in B ssh A to transfer the keys, the following message appaers

You have no controlling tty.  Cannot read passphrase.
You have no controlling tty.  Cannot read passphrase.
lost connection

how do i overcome this?

Answer : Problem: SSH Key exchange

add "-t" option to ssh invocation.