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Problem
Read a natural number `n` and print the sum of its digits, computed using **a recursive function**. Iterative solutions (with `while`/`for`) are not accepted; an explicitly self-calling function must be defined.
Define a recursive function `sumDigits(n)` that returns the digit sum of `n`. The function must use the relation:
```
sumDigits(0) = 0
sumDigits(n) = n % 10 + sumDigits(n / 10), for n > 0
```
Input format
Input
input.txt
The program reads from standard input a single natural number `n`. - `0 <= n <= 1.000.000.000` - The implementation must be recursive (define and call a self-calling function).
Output format
Output
output.txt
The program prints to standard output a single natural number: the digit sum of `n`, followed by a newline.
Example
input
12345
output
15
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Sample cases (from the problem)
Sample Case 1
Input
12345
Expected output
15
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