Task: Program Execution
Input (English): Y, B, t, 2021, 4963, 2515, 6083, 7525, 845, L, P, 3719, 7799, 4267, 2411, m, l, c, 1493, 7943
Output (English): 1, 2, 3, 10, 11, 16, 17, 18