print("hi there")
				
			

print("hello world")


				
			

# basic email regex in python
import re

string = "The emails are john.doe@example.com, alex@example.com"

pat = r"\b[^\s]+@[^\s]+\.[^\s]+\b"

m = re.findall(pat, string)
print(m)
# done

				
			

# basic linked list in python

class Node:
    def __init__(self, value=None, next=None):
        self.value = value
        self.next = next

class LinkedList:
    def __init__(self, head=None):
        if not head:
            self.head = Node()

# and other attributes can be added.