Task: Program Execution
Input (English): E, 6143, t, c, s, J, f, 9741, 5871, j, 4759, 3075, I, 1301, 2599, m, 7707, L, 2765, W, 137, N, 5247, Q
Output (English): 2, 8, 9, 11, 12, 14, 15, 17, 19, 21, 23