#689. Sums of groups of 4
Split the list into groups of 4 elements in a row (the last group may be smaller). Print the sum of each group.
### Input
The first line has n, the second line has n integers separated by spaces.
### Output
One line.
Examples
Input
2 -7 0
Output
-7
Input
15 -6 -7 -8 -1 -7 5 -4 -4 -2 8 -8 3 1 -3 -1
Output
-22 -10 1 -3
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.