After hearing about a letter from eighth-grader Ty'Sheoma Bethea to her congressman pleading for the basic school necessities she and her classmates needed, Walmart (NYSE: WMT) began to wonder: how many other pleas are going unheard? Inspired by the courageous effort of one 14-year-old girl, Walmart launched the "Write to Change the Classroom" program, asking teachers, parents and students to write about their school-supply needs.More on Walmart's 'Write to Change the Classroom' Program