Task: Program Execution
Input (English): B, 5955, 637, 7217, 6949, 4343, 6581, 723, 1879, 2761, J, 5473, 8597, p, i, 4467, U, 5045, 8797, y, t
Output (English): 1, 11, 14, 15, 17, 20, 21