James came across the next problem in a newspaper. It said

“Bring order to the word and your nation shall be bestowed upon with the same”

The task was to print the letters of the word in the order of their occurrence in the alphabet.

Take a string input(all alphabets and in lower case) from the user and print the character in alphabetical order.

Sample Input:
elementary

Sample Output:
aeeelmntry

SAMPLE INPUT
elementary

SAMPLE OUTPUT
aeeelmntry

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