alias turev return $iif($pos($1,x,0) = 1 && $len($1) > 1,$iif($left($1,1) = x,$iif($calc($mid($1,$calc($pos($1,x) + 1),$len($1)) - 1) = 1,$+($mid($1,$calc($pos($1,x) + 1),$len($1)),x),$+($mid($1,$calc($pos($1,x) + 1),$len($1)),x,$calc($mid($1,$calc($pos($1,x) + 1),$len($1)) - 1))),$iif($right($1,1) = x,$mid($1,$+(-,$pos($1,x)),$calc($len($1) - 1)),$iif($calc($mid($1,$calc($pos($1,x) + 1),$len($1)) - 1) = 1,$+($calc($left($1,1) * $mid($1,$calc($pos($1,x) + 1),$len($1))),x),$+($calc($left($1,1) * $mid($1,$calc($pos($1,x) + 1),$len($1))),x,$calc($mid($1,$calc($pos($1,x) + 1),$len($1)) - 1))))),$iif($1 = x,1,))

//echo -a $turev(3x4)

>> 12x3

---

//echo -a $turev(x4)

>> 4x3

---

//echo -a $turev(11x)

>> 11