Only the words that are made up of them do. The individual letters in a word don't mean anything. By themselves, they simply indicate what sound you're supposed to make. For example, the letter s indicates the s sound (which sounds like ssssss).
About Rupert Boneham. Rupert Boneham (born January 27, 1964) is an American mentor for troubled teens, who became known to reality television audiences in 2003 as a contestant on Survivor: Pearl Islands where he placed 8th. He later appeared on the All Stars, Heroes vs. Villains, and Blood vs. Water seasons of Survivor, placing 4th, 6th, and 20th respectively.
Designated Survivor was renewed for a second season on May 11, 2017. Former The Good Wife executive producer Keith Eisner will take over as showrunner for the second season. Eisner will be the fourth showrunner for the show, replacing Jeff Melvoin, who was hired as showrunner in December 2016, taking over for Jon Harmon Feldman.