The Spoiled Marathoner

A marathon is held that every runner wants to enter, whatever their nationality or age. The race covers 42.195 km, and because the entry is so sought after, every entrant has finished it year after year. Every entrant but one!

Other runners would do anything for a place at the start line. Who is the spoiled entrant who took one and then failed to finish?

The first line contains the number of entrants $N$. ($1 \le N \le 10^5$)

The next $N$ lines each contain the name of one entrant.

The following $N-1$ lines each contain the name of one runner who finished.

Each name is a string of lowercase letters with length between 1 and 20, inclusive.

Two entrants may share the same name.

Print the name of the entrant who did not finish the marathon.