Problems
Neighbors of the same sign
Neighbors of the same sign
Array of $n$ integers is given. Print the pairs of adjacent elements of the same sign. If there are no adjacent elements of the same sign, print nothing.
\InputFile
The first line contains number $n$. The next line contains $n$ integers. All numbers do not exceed $100$ by absolute value.
\OutputFile
Print the pairs of adjacent elements of the same sign.
Input example #1
7 9 5 -7 -7 5 -9 -4
Output example #1
9 5 -7 -7 -9 -4
Input example #2
10 -8 -10 -2 1 -9 5 -9 0 0 -9
Output example #2
-8 -10 -10 -2