Suppose that
\( \[|a - b| + |b - c| + |c - d| + \dots + |m-n| + |n-o| + \cdots+ |x - y| + |y - z| + |z - a| = 20.\] \)
What is the maximum value of |a-n|?
Please help ASAP
Any two letters differ by at most 20, so the maximum value of |a - n| is also 20.