Matching value of an array regardless of position in javascript

I am trying to compare a string to an array using the following code:

var str = "ML00000";
var arr = ["MC", "CV", "ML", "LV"];
for (var i = 0, len = arr.length; i < len; ++i) 
{
   if (str.indexOf(arr[i]) != -1) 
   {
    document.write("YES");
   }
   else
   {
   document.write("NO");
   }    
}

It is currently returning "NO NO YES NO" - I would like for the output to be either YES or NO when a match of the string has been found.

Any help on this would be greatly appreciated!

Thank you - Matt