#MATL, 13 12 bytes

`jt4Y2m&)hDT

Exits with an error (allowed by default), producing the correct output.

Try it online!

###Explanation

`          T    % infinite loop
 j              % input one line as a string
  t             % duplicate
   4Y2          % predefined literal: '0123456789'
      m         % true for elements of string that are digits, false for the rest
       &)       % two-output indexing: push digits, then non-digits
         h      % concatenate the two strings
          D     % display

MATL, 13 12 bytes

`jt4Y2m&)hDT

Exits with an error (allowed by default), producing the correct output.

Try it online!

Explanation

`          T    % infinite loop
 j              % input one line as a string
  t             % duplicate
   4Y2          % predefined literal: '0123456789'
      m         % true for elements of string that are digits, false for the rest
       &)       % two-output indexing: push digits, then non-digits
         h      % concatenate the two strings
          D     % display

#MATL, 13 12 bytes

`jt4Y2m&)hDT

Exits with an error (allowed by default), producing the correct output.

Try it online!

###Explanation

`          T    % infinite loop
 j              % input one line as a string
  t             % duplicate
   4Y2          % predefined literal: '0123456789'
      m         % true for elements of string that are digits, false for the rest
       &)       % use as index with two outputs: push digits, then non-digits
         h      % concatenate the two strings
          D     % display contacatenated string

#MATL, 13 12 bytes

`jt4Y2m&)hDT

Exits with an error (allowed by default), producing the correct output.

Try it online!

###Explanation

`          T    % infinite loop
 j              % input one line as a string
  t             % duplicate
   4Y2          % predefined literal: '0123456789'
      m         % true for elements of string that are digits, false for the rest
       &)       % two-output indexing: push digits, then non-digits
         h      % concatenate the two strings
          D     % display

#MATL, 13 bytes

`jt4Y2m_2$SDT

Exits with an error (allowed by default), but produces the correct output.

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###Explanation

`           T    % infinite loop
 j               % input one line as a string
  t              % duplicate
   4Y2           % predefined literal: '0123456789'
      m          % true for elements of string that are digits, false for the rest
       _         % negate
        2$S      % sort string according to whether chars are digits or not
           D     % display line

#MATL, 13 12 bytes

`jt4Y2m&)hDT

Exits with an error (allowed by default), producing the correct output.

Try it online!

###Explanation

`          T    % infinite loop
 j              % input one line as a string
  t             % duplicate
   4Y2          % predefined literal: '0123456789'
      m         % true for elements of string that are digits, false for the rest
       &)       % use as index with two outputs: push digits, then non-digits
         h      % concatenate the two strings
          D     % display contacatenated string