How to automate Gmail login process using Selenium Webdriver in java?

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#1 
import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;

import org.openqa.selenium.WebDriver;

import org.openqa.selenium.WebElement;

import org.openqa.selenium.firefox.FirefoxDriver;

import org.openqa.selenium.support.ui.ExpectedConditions;

import org.openqa.selenium.support.ui.WebDriverWait;


public class GmailDemo {

    public static void main(String[] args) {

            WebDriver driver = new FirefoxDriver();

            driver.manage().window().maximize();

            String url = "https://accounts.google.com/signin";

            driver.get(url);

            driver.findElement(By.id("identifierId")).sendKeys("raj8805"); 

            //driver.manage().timeouts().implicitlyWait(20, TimeUnit.SECONDS);      

            WebDriverWait wait=new WebDriverWait(driver, 20);               

            driver.findElement(By.xpath("//span[@class='RveJvd snByac']")).click();         

            driver.manage().timeouts().implicitlyWait(50, TimeUnit.SECONDS);        

            driver.findElement(By.xpath("//input[@class='whsOnd zHQkBf']")).sendKeys("asassassa");             

            driver.findElement(By.xpath("//span[@class='RveJvd snByac']")).click(); 

    }  

}

The problem is that, after mail id page, my password is getting written in the id box option & the server redirects to next password page. I want to ask, what should I do so that my password would be entered only in password page?