System.setProperty("webdriver.gecko.driver", "C:\Users\pryanichnikov\Downloads\geckodriver-v0.19.0-win64\geckodriver.exe");
    WebDriver driver = new FirefoxDriver();

    driver.get("https://www.qunar.com/");

    WebElement tabButton = driver.findElement(By.id("js_inter_tab"));
    tabButton.click();

    WebElement input = driver.findElement(By.xpath("//input[contains(@name,'fromCity')]"));
    input.sendKeys("SFO");