What you show above is a Silverlight smooth stream manifest that appears to be coming from Akamai. Wowza does not support ingress of smooth streams, or any stream over HTTP (except shoutcast).
You can re-stream RTMP from Akamai if the stream is unprotected. If the source of the above manifest is something like
http://[akamai-address]/appname/myStream/Manifest
, try playing it back in RTMP Wowza player:
Server: rtmp://[akamai-addddress:1935/appname
Streamname: myStream
If RTMP playback works, then you can try to re-stream it following this guide
If it is protected, re-streaming following that guide will not work. In that case, you cannot use that source.
Richard