Task: Program Execution
Input (English): 4529, Q, L, 5989, 4149, 6697, 9321, t, 3965, F, I, 1335, e, 4561, y, Z, f, a, Z, 1339, A, 9211, 6529
Output (English): 2, 3, 8, 10, 11, 13, 15, 16, 17, 18, 19, 21