Task: Program Execution
Input (English): 4911, 7629, f, l, 6121, g, k, F, L, 9007, V, z, 7391, f, 3689, t, N, d, 2463, 8511, a, c, 7891, B
Output (English): 3, 4, 6, 7, 8, 9, 11, 12, 14, 16, 17, 18, 21, 22, 24