In this task, you need to replace a letter in the sentence with another given letter.

Ex Input:
Sentence: 'a man who is surfing in a wave in the ocean'. Replace the letter 'a' with 'u' in the sentence.

Ex Output:
u mun who is surfing in u wuve in the oceun


Ex Input:
Sentence: 'a giraffe sticks its tongue out in the air'. Replace the letter 'e' with 'l' in the sentence.

Ex Output:
a giraffl sticks its tongul out in thl air


Ex Input:
Sentence: 'a colorful kite is stuck in a tree with white flowers'. Replace the letter 'r' with 'e' in the sentence.

Ex Output:

a coloeful kite is stuck in a teee with white flowees