Task: Program Execution
Input (English): 4593, E, x, 5177, 9115, 4791, 107, 3585, J, 1439, J, 8733, 4759, W, D, 1765, V, M, 1811, 8583, 9517
Output (English): 1, 4, 5, 6, 7, 8, 10, 12, 13, 16, 19, 20, 21