CJam, 31 26 bytes
q_)/_S*S%@_]:,:s),f{Se[}S*
Try it online!
How it works
q_ e# Read all input from STDIN and push two copies.
) e# Pop the last character (linefeed) of the second copy.
/ e# Split the remaining string at linefeeds.
_ e# Push a copy.
S* e# Join the copy, separating by spaces.
S% e# Split at runs of spaces.
@_ e# Rotate the original input on top and push a copy.
] e# Wrap all four items in an array.
:, e# Get the length of each item.
:s e# Cast the lengths (integers) to strings.
) e# Pop the last length (byte count).
, e# Get the number of digits.
f{Se[} e# Left-pad all three length with spaces to that length.
S* e# Join, separating by spaces.
