add radix to parseInt

Before
```javascript
parseInt(input);
```
After
```javascript
parseInt(input, 10);
```

**[radix](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt)**
An integer that represents the radix of the above mentioned string. Always specify this parameter to eliminate reader confusion and to guarantee predictable behavior. Different implementations produce different results when a radix is not specified.