cannot push code to a new repository

I am new to git and created an account and tried to push my code to it (after creating new repository and commiting).

C:\Users\Me\workspace\MyProg>git push -u origin --all
The authenticity of host 'bitbucket.org (131.103.20.167)' can't be established.
RSA key fingerprint is 97:8c:1b:f2:6f:14:6b:5c:3b:ec:aa:46:46:74:7c:40.
Are you sure you want to continue connecting (yes/no)? y
Please type 'yes' or 'no': yes
Warning: Permanently added 'bitbucket.org,131.103.20.167' (RSA) to the list of k
nown hosts.
Permission denied (publickey).
fatal: The remote end hung up unexpectedly

I tried again and got

ssh_exchange_identification: Connection closed by remote host
fatal: The remote end hung up unexpectedly