Create a Python program which concatenates two sentences and prints the result.
The sentence to be concatenated is "I am writing a Python program." and "It is exciting to learn something new."
sentence1 = "I am writing a Python program."
sentence2 = "It is exciting to learn something new."

# Concatenate both strings
concatenated_sentence = sentence1 + " " + sentence2

# Print the result
print(concatenated_sentence)