Task: Program Execution
Input (English): f, 3579, b, 5389, f, 9767, 441, a, c, t, v, y, e, 6403, u, i, c, q, 621, j, s, c, 3325, i
Output (English): a, b, c, e, f, i, j, q, s, t, u, v, y