Task: Program Execution
Input (English): PpHUECxBmIkOmIqpZUkIdKFgSHggEPwxiemXks, HKYaJlWMHdkOmIqpZUkIdKFgeSTN
Output (English): b, c, d, e, f, g, h, i, k, m, o, p, q, s, u, w, x, z