Task: Program Execution
Input (English): J, 3997, 9137, 3047, 4247, i, x, 9681, 7677, p, x, 9667, y, 4499, G, 87, Y, O, f, 563, 6695, 7637, k, D
Output (English): 2, 3, 4, 5, 8, 9, 12, 14, 16, 20, 21, 22