Reverse a String

Problem

Reverse a given string without using Python's built-in slice `[::-1]` — demonstrate the two-pointer technique.

Input

A single line containing the string.

Output

The reversed string.

Constraints

1 ≤ |s| ≤ 10^5

Sample input

codekilla

Sample output

allikedoc

Explanation

Every character is swapped to its mirror position.

stringstwo-pointersbasics@Amazon@Infosys

Visible test cases

in: codekilla

out: allikedoc

in: a

out: a

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python