{{ score }}
  # convert ed to openssh format
puttygen id_ecdsa -o id_ecdsa.ppk

# password protected will not work (error: unrecognized cipher name)
# need to remove password first
ssh-keygen -p -f id_ecdsa
# then run puttygen convert

# convert ppk to pem
puttygen id_ecdsa.ppk -O private-openssh -o id_ecdsa.pem