Two fixed lines $l_1$ and $l_2$ are perpendicular to each other at a point $Y$. Points $X$ and $O$ are on $l_2$ and both are on one side of line $l_1$. We draw the circle $\omega$ with center $O$ and radius $OY$. A variable point $Z$ is on line $l_1$. Line $OZ$ cuts circle $\omega$ in $P$. Parallel to $XP$ from $O$ intersects $XZ$ in $S$. Find the locus of the point $S$.

[i]Proposed by Nima Hamidi[/i]
1. **Setup and Definitions**:
   - Let \( l_1 \) and \( l_2 \) be two perpendicular lines intersecting at point \( Y \).
   - Points \( X \) and \( O \) lie on \( l_2 \) such that \( O \) is the center of circle \( \omega \) with radius \( OY = R \).
   - A variable point \( Z \) lies on \( l_1 \).
   - Line \( OZ \) intersects circle \( \omega \) at point \( P \).
   - A line parallel to \( XP \) from \( O \) intersects \( XZ \) at point \( S \).

2. **Assumptions and Notations**:
   - Assume \( X \) is between \( O \) and \( Y \), and \( P \) is between \( O \) and \( Z \).
   - Let \( V \) be the midpoint of \( \overline{XY} \).
   - Let \( K \) be the orthogonal projection of \( S \) on \( l_2 \).

3. **Similar Triangles**:
   - From the similarity of triangles \( \triangle SKX \sim \triangle ZYX \) and \( \triangle PXZ \sim \triangle OSZ \), we derive the following relationships:
     \[
     \frac{SK}{ZY} = \frac{SX}{ZX} = \frac{R}{PZ}
     \]
     \[
     \frac{SK^2}{ZY^2} = \frac{SK^2}{PZ(PZ + 2R)} = \frac{R^2}{PZ^2}
     \]

4. **Expression for \( SK \)**:
   - From the above relationships, we get:
     \[
     SK^2 = \frac{PZ + 2R}{PZ} \cdot R^2
     \]

5. **Expression for \( XK \)**:
   - Using the similarity of triangles, we also have:
     \[
     \frac{XK}{XY} = \frac{SX}{ZX} = \frac{R}{PZ}
     \]
     \[
     \frac{2KV}{XY} = \frac{2(XK + \frac{1}{2}XY)}{XY} = \frac{PZ + 2R}{PZ}
     \]

6. **Combining Expressions**:
   - Combining the expressions for \( SK \) and \( XK \), we obtain:
     \[
     SK^2 = KV \cdot \frac{2R^2}{XY}
     \]

7. **Conclusion**:
   - The locus of point \( S \) is a parabola with focal axis \( l_2 \), vertex \( V \) (the midpoint of \( \overline{XY} \)), and latus rectum length given by \( \frac{2R^2}{XY} \).

The final answer is the locus of \( \boxed{ S } \) is a parabola with focal axis \( l_2 \), vertex \( V \), and latus rectum length \( \frac{2R^2}{XY} \).