class StdWrapper(IOBase):

def __init__(self, fileName):
    super().__init__()
    self.active   = True
    self.fileName = fileName
    self.write("=== terminal log ===\n\n", "w")
    os.dupterm(self)
    
    
def __del__(self):
    self.close()
    
    
def close(self):
    if self.active:
        self.write("\n\n=== end of log ===")
        os.dupterm(None)
        self.active = False
    
    
def write(self, s: str, mode = "a"):
    with open(self.fileName, mode) as f:
        return f.write(s)


def readinto(self, b):
    try:
        os.dupterm(None)
        result = sys.stdin.readinto(b)
        self.write("(input %d bytes) " % result)
    finally:
        os.dupterm(self)
    return  result`