Task: Program Execution
Input (English): V, W, 7971, Q, s, 6917, Z, X, l, h, Z, 3243, 1567, E, 4113, P, C, f, L, 1583, z
Output (English): 1, 2, 4, 5, 7, 8, 9, 10, 11, 14, 16, 17, 18, 19, 21