An array shows 3 numbers randomly, and I had to write a code that sums the 3 numbers, but the array has a trick to sometimes show a string:

```
[96, ".!asd", 182]
["@#$%", 5, 43]
[64, "bd", 48]

```

I would like to use an "if" that would return "not valid" if there's a string in the array.

```
if (...){
    return not valid
}

```

Please, if there's a way to identify any string, could you tell me the code?