Task: Program Execution
Input (English): 1965, 4009, a, 3965, W, 2947, 9379, 6247, H, U, d, Z, 6901, 8201, e, 8365, 6965, 7369, a, U
Output (English): 3, 5, 9, 10, 11, 12, 15, 19, 20