Task: Program Execution
Input (English): 5281, 4119, H, 9635, W, 5907, 6371, z, 6561, 9767, 3507, 7465, M, c, x, e, 6853, H, 9387, k, 2671, 765
Output (English): 3, 5, 8, 13, 14, 15, 16, 18, 20