import telnetlib

def check_input_error():
    tn = telnetlib.Telnet("10.209.10.111", 2168)
    tn.write("/\r\n".encode('ascii'))
    for _ in range(3):
        output = tn.read_until(b"Input error", timeout=3).decode('ascii')
        print(output)
        if "Input error" in output:
            return True
    return False

result = check_input_error()
print(result)