Task: Program Execution
Input (English): 6631, z, 9737, L, 2001, V, d, M, 1087, z, c, B, q, D, M, 6893, H, 5707, 9663, k, s
Output (English): 2, 4, 6, 7, 8, 10, 11, 12, 13, 14, 15, 17, 20, 21