135. Digital Root
EasyDigitsModular Arithmetic
Repeatedly sum the digits of n until one digit remains. Print it.
Input format
A single non-negative integer n (up to 10⁵ digits).
Output format
The digital root.
Example 1
Input
38
Output
2
Example 2
Input
0
Output
0
Constraints
0 ≤ n
Read input from standard input and print the answer to standard output. Your code is judged against 5 test cases, most of them hidden.
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