Task: Program Execution
Input (English): C, U, f, 3743, c, i, 4847, T, e, B, 5985, P, s, D, 409, V, A, 3559, 2721, C, J
Output (English): 1, 2, 3, 5, 6, 8, 9, 10, 12, 13, 14, 16, 17, 20, 21