importance: 5

---

# Fix the addition

Here's a code that asks the user for two numbers and shows their sum.

It works incorrectly. The output in the example below is `12` (for default prompt values).

Why? Fix it. The result should be `3`.

```js run
let a = prompt("First number?", 1);
let b = prompt("Second number?", 2);

alert(a + b); // 12
```