Task: Program Execution
Input (English): 2531 L c 3937 8153 947 1655 5529 313 L T q e 1919 W n c U 9475 8173 H 5961 a 4525 8243 5781 N M 521 l o a
Output (English): 2, 3, 10, 11, 12, 13, 15, 16, 17, 18, 21, 23, 27, 28, 30, 31, 32