title: Getting indices of elemenst of list that meet certain expression - Wolfram Mathematica
body: <p>Is there method to get indices of certain elements of list Wolfram Mathematica ?. For visualisation of problem say I have two list,
  {2,3,4,5} and {s1,s2,s3,s4}. I want to take indices of even elements of first list so in return get {1,3} and that get coresponding elements from second list that is s1,s3. I know there is Select[] method but this take elements not indices Thanks for help.</p>