Six people $U,V,W,X,Y,$ and $Z$ stand in a line. $Y$ is between $V$ and $Z$. $W$ is to the immediate left of $V$. $X$ is not at either end. $U$ is to the immediate right of $Z$. If $W$ is at the far left, who is in the $4^{\text{th}}$ position from the left?