Task: Program Execution
Input (English): F, 9749, N, s, N, Z, 667, l, 5191, k, Y, 1925, 3745, 7825, 5, t, g, 3395, S, s, U
Output (English): 1, 3, 4, 5, 6, 8, 10, 11, 16, 17, 19, 20, 21