Given a string pathway with asteroids marked by asterisks $()$ and the closest nonasteroid character to its left.

Example Process:

For the input "orif$*$gi$$nnn$**".$

Shield at the $1$st asteroid $0$: removes ${?}^{1**\text{'}}$ and closest nonasteroid character to its left $\text{'}$e$\text{'}.$ Result: "origii$*$nnn$**"$

Shield at the $2$nd asteroid $0$ : removes ${?}^{\text{'}**1}$ and closest nonasteroid character to its left $\text{'}$e$\text{'}.$ Result: "originnn$**"$

Shield at the $3$rd asteroid $0$: removes $\text{'}"$

Shield at the last asteroid $0$ : removes $\text{'}{?}^{**\text{'}}$ and closest nonasteroid character to its left $\text{'}n\text{'}.$ Result: "origin"

Input:

A string representing the pathway

Output:

A string representing the cleared pathway without any asteroids