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

Ex Input:
Sentence: 'a cat got caught hiding in the cupboard'. Replace the letter 'i' with 'u' in the sentence.

Ex Output:
a cat got caught hudung un the cupboard


Ex Input:
Sentence: 'a zebra is eating hay in a fenced enclosure'. Replace the letter 'e' with 'i' in the sentence.

Ex Output:
a zibra is iating hay in a fincid inclosuri


Ex Input:
Sentence: 'the sand area of a beach with people on different area under umbrellas and sitting on towels'. Replace the letter 'a' with 'g' in the sentence.

Ex Output:

the sgnd greg of g begch with people on different greg under umbrellgs gnd sitting on towels