410652: GYM104069 D Diary of Hapiness

Gustavo de Medeiros is a guy who cares a lot about his health. Knowing that mental health is a very important topic, he decided to keep track of his days by using a diary. Each day, Gustavo writes an integer grade in the interval $$$[-10,10]$$$ which reflects how he felt about that day. So, good days are days with a positive grade, bad days have negative grades and normal days have a grade of 0.

Gustavo registered the grade for the last $$$n$$$ days and needs your help to determine what is the average of the grades.

The first line has a positive integer number $$$n$$$ $$$(n\leq10^5)$$$, the number of days that Gustavo registered its grade. The next line has a list of $$$n$$$ integers, such that each of them is in the interval $$$[-10,10]$$$, representing the grade of each day.

Print the string ":)" (without quotes), if the average of the grades is positive, ":|" if the average is zero, and ":(" if the average is negative.

5
10 10 10 10 10

:)

2
-1 1

:|

3
1 2 -4

:(