Divide a String into 'a' and 'b' Parts

Given a string ( s ) composed exclusively of the characters a and b, determine whether you can split it into two non‑empty parts ( s_1 ) and ( s_2 ) such that ( s_1 ) consists solely of a and ( s_2 ) consists solely of b.

If such a division exists, output the two parts separated by a single space. Otherwise, output NO.

inputFormat

A single line containing a string ( s ) made up of only a and b.

outputFormat

If the division is possible, output the two parts separated by a single space. Otherwise, output NO.## sample

aaabbb

aaa bbb