Infinite sum of digits

Given an integer n, you are asked to compute the infinite sum of its digits.
We’ll say that the infinite sum of digits is the following process:
  • Compute the sum of digits of n and assign it to n
  • Repeat that process until n is a single-digit number
The input contains a single integer n.
The program should print a single integer - the infinite sum of digits of n.
Input
Output
64
1
8
8
The explanation for 64: 64 → 6 + 4 = 10 → 1 + 0 = 1 ⇒ 1 is the answer
 
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