Reversing Specific Words in a User-given Sentence

sentence = input("Enter a Sentence : ")
letter = input("Enter a letter : ")

if letter in sentence:
    new_sentence = ""
    words = sentence.split()

    for i in words:
        if letter in i:
            new_sentence += i[::-1] + " "
        else:
            new_sentence += i + " "

    print("Modified Sentence : ", new_sentence)

else:
    raise ValueError(f"The Letter {letter} does not exist in the Sentence")

"""
Output:-

Enter a Sentence : the quick brown fox jumps over the lazy dog
Enter a letter : o
Modified Sentence :  the quick nworb xof jumps revo the lazy god
>>>
"""