Problem
Given a non-negative integer N, determine if all its digits are odd using recursion.
Input format
Input
input.txt
- A single integer N (0 ≤ N ≤ 100000)
Output format
Output
output.txt
- "YES" if all digits are odd, "NO" otherwise
Example
input
135
output
YES
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Sample cases (from the problem)
Sample Case 1
Input
135
Expected output
YES
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