Task: Program Execution
Input (English): yPIILuIwIUDWfDsCfxisMMSpjcz, FeKgRZQQISYWBQwIUDWfDsCfxisMUNIXZkaNeS
Output (English): a, b, c, d, e, f, g, i, k, m, n, q, r, s, u, w, x, y, z