Task: Program Execution
Input (English): a, 4019, 3263, 5351, 1489, 6401, 3537, u, 9731, U, 5129, 9067, 7289
Output (English): 1, 4019, 3263, 5351, 1489, 6401, 3537, 21, 9731, 21, 5129, 9067, 7289