Let's take a look at the relationship between the given angle (158 degrees) and angle S. There are multiple ways to solve this problem because the two lines are parallel, but I will discuss one here.
The 158 degree angle and angle S are on the same side of the transversal. They are also on the outside of the parallel lines. This means that these angles are same-side exterior angles. Same-side exterior angles are supplementary, which means that they add up to 180 degrees.
158 + s = 180
s = 22
Answer: angle s = 22 degrees
Hope this helps!