Problem
Given a non-negative integer N, find the product of its digits using recursion.
Input format
Input
input.txt
- A single integer N (0 ≤ N ≤ 100000)
Output format
Output
output.txt
- The product of the digits of N
Example
input
1234
output
24
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Sample cases (from the problem)
Sample Case 1
Input
1234
Expected output
24
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