Task: Program Execution
Input (English): B, 3887, c, 8121, 9265, Y, B, D, 2459, C, A, 191, G, 9065, 7351, c, 7617, 3899, e, 2207, F, c, 1851
Output (English): 2, 4, 5, 9, 12, 14, 15, 17, 18, 20, 23