public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  String str = scan . next ( ) ;
  int a = 0 , b = 0 , c = 0 ;
  for ( int i = 0 ;
  i < str . length ( ) ;
  i ++ ) {
    char z = str . charAt ( i ) ;
    if ( z == '1' ) a ++ ;
    else if ( z == '2' ) b ++ ;
    else if ( z == '3' ) c ++ ;
  }
  StringBuffer buffer = new StringBuffer ( ) ;
  while ( a -- > 0 ) {
    buffer . append ( "+1" ) ;
  }
  while ( b -- > 0 ) {
    buffer . append ( "+2" ) ;
  }
  while ( c -- > 0 ) {
    buffer . append ( "+3" ) ;
  }
  String ans = buffer . substring ( 1 , buffer . length ( ) ) ;
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; String str = scan . next ( ) ; int a = 0 , b = 0 , c = 0 ; for ( int i = 0 ; i < str . length ( ) ; i ++ ) { char z = str . charAt ( i ) ; if ( z == '1' ) a ++ ; else if ( z == '2' ) b ++ ; else if ( z == '3' ) c ++ ; } StringBuffer buffer = new StringBuffer ( ) ; while ( a -- > 0 ) { buffer . append ( " + 1" ) ; } while ( b -- > 0 ) { buffer . append ( " + 2" ) ; } while ( c -- > 0 ) { buffer . append ( " + 3" ) ; } String ans = buffer . substring ( 1 , buffer . length ( ) ) ; System . out . println ( ans ) ; }
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