SFTP SSH Connection - User Public Key

[AguilarTech]

Hi, 

I am needing to connect to someone's SFTP server using the SFTP - SSH connector, however, the person is asking me to first provide the public key so that they may create a user login into their SFTP server. 

How do I go about creating a  user "public key" for the SFTP SSH connector? 

I understand how to login once they give me a SSH host private key but where do I get the user public key to give them? 

[mohsinkhalid]

The public key should be generated by them while they create a private key. Please read more on it here https://winscp.net/eng/docs/ssh_keys#user_public_key