title: How to put different symbols in autoplot
body: <p>I'm having some troubles with <code>autoplot()</code> in survival objects. I will take the below as example</p>
  
  <pre><code>library(ggplot2)
  library(ggfortify)
  library(survival)
      datalung &lt;- lung
      fitlung&lt;- survfit(Surv(time,status) ~ sex,type = "kaplan-meier",data=datalung)
      autoplot(fitlung,conf.int=FALSE,pVal=TRUE,pX=800)+scale_color_grey()
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/XcWBN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XcWBN.png" alt="enter image description here"></a></p>
  
  <p>In the example above, sex 1 and 2 have different grey scales, with just 2 groups it's fine to see the different groups.</p>
  
  <p>The real dataset that I'm using have 9 different groups, and is hard to see the differents curves with this grey scale. I can't use colours. What I'm looking for is a way to put symbols to different groups, but I can't find this parameter in <code>autoplot</code>.</p>
  
  <p>The <code>surv.linetype</code> have the option <code>solid</code> and <code>dashed</code>, but it changes all curves with same pattern and I don't want it. Taking the <code>lung</code> data as example, I want to put different <code>linetype</code> for sex 1 and sex 2.</p>