Task: Program Execution
Input (English): 7049, 971, 411, H, C, M, J, u, Z, 9753, 3979, L, 8689, t, u, 4681, m, Y, V, r, 2591
Output (English): 4, 5, 6, 7, 8, 9, 12, 14, 15, 17, 18, 19, 20