Teachers will often teach the five elements of plot by using a pyramid or triangle. It is an effective visual shape for plot because it shows students how a story will build in intensity up to the climax and then bring readers back to a place of calmer resolution. The peak of the triangle is the climax, and the exposition and rising actions lead up to it. The falling action and resolution come after the climax.

I am assuming that this question is also asking for a basic plot element overview of the story "The Sniper." The exposition is the story's introduction. We are introduced to a sniper that is used to seeing death, and he is perched on top of a building in Dublin during a civil war. The story's rising action has the sniper lighting up a cigarette and immediately coming under fire from another sniper. While worrying about that sniper, our protagonist still manages to shoot and kill other enemies; however, he is wounded in the process.

The climax of the story has the protagonist using trickery to expose the enemy sniper in order to get a kill shot. With the enemy sniper killed, the story moves into the falling actions of him feeling a bit of remorse and disgusted with the war in general. He decides to go find out who he killed, and that leads to the story's resolution. The sniper realizes that he just killed his brother.