Extract Middle Characters

Background

Congcong is learning string processing and encountered an interesting small problem.

Problem Description

Given a string of even length, return a string made of the middle two characters. For example, the string "string" yields "ri". The string length will be at least $2$.

Input Format

Input is given from standard input in the following format.

An even-length string $S$.

Output Format

Output is printed to standard output in the following format.

The string consisting of the middle two characters of string $S$.

Sample

string

"ri"

code

"od"

Practice

"ct"

Sample Explanation

For the first sample, the string "string" has a length of $6$. The middle two characters are 'r' and 'i' at indices $2$ and $3$ (assuming $0$-indexed), which combine to "ri". For the second sample, the string "code" has a length of $4$. The middle two characters are 'o' and 'd' at indices $1$ and $2$ (assuming $0$-indexed), which combine to "od".

Constraints

Time limit: $1$ second, Memory limit: $1024$ KiB for each test case.