Pog has lots of strings. And he always mixes two equal-length strings. For example, there are two strings: "abcd" and "efgh". After mixing, a new string "aebfcgdh" is coming.
However, szh thinks it is boring, so he reverses the second string, like changing "efgh" to "hgfe". Then mix them as usual, resulting in "ahbgcfde".
Now, here comes a problem. Pog is given a string after mixing by szh, but he wants to find the original two strings.
Hint : In this question, it needs a linefeed at the end of line at hack time.