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JavaScript basicsCoding problems

JavaScript basics: coding problems

Write a program that reads the input and prints the answer. Run checks it against every test, including hidden ones.

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Maya is checking a ticket number. She adds up all its digits to see whether the total is small enough to be lucky. Given a non-negative whole number n, print the sum of its digits.
Constraints: 0 <= n <= 1000000000.
Input. One line with the integer n.
Output. One integer: the sum of the digits of n.
Example 1 input
```
4821
```
Output
```
15
```
Example 2 input
```
7
```
Output
```
7
```
LanguageJavaScript
const input = require("fs").readFileSync(0, "utf8"); // your code here