import threading

# Function to print numbers
def print_numbers():
    for i in range(1, 6):
        print('Number:', i)

# Function to print letters
def print_letters():
    for letter in 'abcde':
        print('Letter:', letter)

# Create threads for each function
t1 = threading.Thread(target=print_numbers)
t2 = threading.Thread(target=print_letters)

# Start both threads concurrently
t1.start()
t2.start()

# Wait for both threads to complete
t1.join()
t2.join()