So I am trying to get the highest number from the following test cases:

```
Test.assertEquals(highAndLow("4 5 29 54 4 0 -214 542 -64 1 -3 6 -6"), "542 -214");
Test.assertEquals(highAndLow("1 -1"), "1 -1");
Test.assertEquals(highAndLow("1 1"), "1 1");

```

So far I have the following:

```
function highAndLow(numbers){
    var numbers;
    var str;
    numbers = numbers.split(' ');
    str = numbers.toString();
    var a = Math.max(str);
    return a;  
}

```

I get `NaN`. I know the .split is working ok. Could someone help me out please?