#543. Middle character
You are given a word. If its length is odd, print the middle letter. If it is even, print the two middle letters.
### Input
One word.
### Output
One line.
Examples
Input
keyboard
Output
bo
Input
loop
Output
oo
💡 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.