Task: Program Execution
Input (English): B, 8535, E, r, 9349, g, q, c, 9385, d, 1617, l, g, S, 6629, 7619, Q, u, h, y, b
Output (English): 1, 3, 4, 6, 7, 8, 10, 12, 13, 14, 17, 18, 19, 20, 21