Task: Program Execution
Input (English): B, C, 4645, 9143, 6903, 7719, 4679, 6421, J, 4297, 1109, 8903, 3033, 4813, d, l, 709, Y, J, L
Output (English): 4645, 9143, 6903, 7719, 4679, 6421, 4297, 1109, 8903, 3033, 4813, 709