Task: Program Execution
Input (English): VNopUBwpWFtNtTnDIKIGjgkAOn, hXbuKiDoTrWFtNtTnDIKIGjgkcCQjB
Output (English): b, c, d, f, g, h, i, j, k, n, o, q, r, t, u, w, x