Task: Program Execution
Input (English): b, 437, 4521, t, J, y, P, A, 6141, 7661, N, o, 8335, 3005, 8597, 8523, 7477, 5781, 9241, v, L, 3153, 3627, 2163
Output (English): 1, 4, 5, 6, 7, 8, 11, 12, 20, 21