The Japanese language is notorious for its sentence ending particles. Personal preference of such particles can be considered as a reflection of the speaker’s personality. Such a preference is called “Kuchiguse” and is often exaggerated artistically in Anime and Manga. For example, the artificial sentence ending particle “nyan ～” is often used as a stereotype for characters with a cat-like personality:
Itai nyan ～ (It hurts, nyan ～)
Ninjin wa iyada nyan ～ (I hate carrots, nyan ～)
Now given a few lines spoken by the same character, can you find her Kuchiguse?
Each input file contains one test case. For each case, the first line is an integer N (2<=N<=100). Following are N file lines of 0 ～256 (inclusive) characters in length, each representing a character’s spoken line. The spoken lines are case sensitive.
For each test case, print in one line the kuchiguse of the character, i.e., the longest common suffix of all N lines. If there is no such suffix, write “nai”.
Sample Input 1:
Itai nyan ～
Ninjin wa iyadanyan ～
uhhh nyan ～
Sample Output 1:
Sample Input 2:
Sample Output 2: