Loops and conditionals together

Given a comma-separated list of integers, print only the even ones — in the order they appear, space-separated.

If there are no even numbers, print nothing (empty line).

Input:  1,2,3,4,5,6
Output: 2 4 6

Constraints

• Write the loop yourself — do not use a built-in filter function.
• Output is space-separated on one line.