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sub a {
$_=shift;do{$_=join'',sort/./g;$i++}while($_=(reverse)-$_)!=495;$i
#23456789012345678901234567890123456789012345678901234567890123456
}

sub a {
$_=shift;do{$_=join'',sort/./g;$_=(reverse)-$_;$i++}until/495/;$i
#2345678901234567890123456789012345678901234567890123456789012345
}

sub a {
$_=pop;do{$_=join'',sort/./g;$_=(reverse)-$_;$i++}until/495/;$i
#23456789012345678901234567890123456789012345678901234567890123
}