Task: Program Execution
Input (English): U, 5251, 1689, C, 7323, z, I, C, I, b, o, 3053, 693, 2523, 2297, 1959, O, 9885, 6707, T, 3971
Output (English): 2, 3, 5, 12, 13, 14, 15, 16, 18, 19, 21