Hello User

You are given a String str. Return the String by Concatenating it with String "Hello, " and an exclamation mark at the end “!”.

Input Format

First Parameter - String str

Output Format

Return a String s

Example 1:

Input:
    "Mac"
Output:
    "Hello, Mac!"
Explanation:
    Given a String, Mac is Concatenated with string "Hello, " at the beginning and "!" at the end

Constraints

• 1 <= length of string <= 20
• Expected Time Complexity: O(1)
• Expected Space Complexity: O(1)