title: merge every other row in R
body: <p>I have this dataframe where the id and values are on two alternating rows.</p>
  
  <pre><code>278             
  8134134 87903   98732   1248    
  9907        
  3134 1450893    1345807 1234    555    
  23              
  23487   12347   3407        
  </code></pre>
  
  <p>I am trying to append the values to the ids so they are on the same row.</p>
  
  <pre><code>278 8134134 87903   98732   1248    
  9907    3134    1450893 1345807 1234    555    
  23  23487   12347   3407    
  </code></pre>
  
  <p>(Also wondering how to format tables in these questions!)</p>