Task: Program Execution
Input (English): 4021 X q H 23 1785 2143 E 111 565 553 q 3273 3367 7827 O Z 3461 W 1953 6439 V 5717 4965 5177 e I
Output (English): 1, 5, 6, 7, 9, 10, 11, 13, 14, 15, 18, 20, 21, 23, 24, 25