Task: Program Execution
Input (English): B, 3561, 4913, 5275, f, x, 4817, d, g, 209, 4875, 2187, 249, 2447, r, s, 5279, x, 7273, o, E
Output (English): 3561, 4913, 5275, 4817, 209, 4875, 2187, 249, 2447, 5279, 7273