Description

You will be given a text and a word. You should:

1. Calculate the character distribution in the text  and sort it using stable ascending sort (from low to high).
2.  Reorder the word using the character distribution order.

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Input

• The first line of input contains a single positive integer n (number of lines of the text) and a word, separated by a comma, followed by newline
• The next n lines contains zero or more characters(with whitespace), they all end in newlines. This will be the text.

Output

The reordered word using the character distribution order, followed by a new line

Sample Input  Download

Sample Output  Download

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