CF45E.Director

普及/提高-

通过率:0%

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题目描述

Vasya is a born Berland film director, he is currently working on a new blockbuster, "The Unexpected". Vasya knows from his own experience how important it is to choose the main characters' names and surnames wisely. He made up a list of nn names and nn surnames that he wants to use. Vasya haven't decided yet how to call characters, so he is free to match any name to any surname. Now he has to make the list of all the main characters in the following format: " Name1Name_{1} Surname1Surname_{1} , Name2Name_{2} Surname2Surname_{2} , ...... , NamenName_{n} SurnamenSurname_{n} ", i.e. all the name-surname pairs should be separated by exactly one comma and exactly one space, and the name should be separated from the surname by exactly one space. First of all Vasya wants to maximize the number of the pairs, in which the name and the surname start from one letter. If there are several such variants, Vasya wants to get the lexicographically minimal one. Help him.

An answer will be verified a line in the format as is shown above, including the needed commas and spaces. It's the lexicographical minimality of such a line that needs to be ensured. The output line shouldn't end with a space or with a comma.

输入格式

The first input line contains number nn ( 1<=n<=1001<=n<=100 ) — the number of names and surnames. Then follow nn lines — the list of names. Then follow nn lines — the list of surnames. No two from those 2n2n strings match. Every name and surname is a non-empty string consisting of no more than 10 Latin letters. It is guaranteed that the first letter is uppercase and the rest are lowercase.

输出格式

The output data consist of a single line — the needed list. Note that one should follow closely the output data format!

输入输出样例

  • 输入#1

    4
    Ann
    Anna
    Sabrina
    John
    Petrov
    Ivanova
    Stoltz
    Abacaba
    

    输出#1

    Ann Abacaba, Anna Ivanova, John Petrov, Sabrina Stoltz
  • 输入#2

    4
    Aa
    Ab
    Ac
    Ba
    Ad
    Ae
    Bb
    Bc
    

    输出#2

    Aa Ad, Ab Ae, Ac Bb, Ba Bc
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