Task: Program Execution
Input (English): 6257, 3649, 8587, f, X, 1921, o, t, c, 2017, S, S, U, v, 5791, 7663, g, B, K, H, z, 4213, r, C
Output (English): 4, 5, 7, 8, 9, 11, 12, 13, 14, 17, 18, 19, 20, 21, 23, 24