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

Ex Input:
Sentence: 'a crowd watches as giraffes graze the tree tops at the zoo'. Replace the letter 't' with 'q' in the sentence.

Ex Output:
a crowd waqches as giraffes graze qhe qree qops aq qhe zoo


Ex Input:
Sentence: 'a tv and equipment sitting on a console'. Replace the letter 't' with 'l' in the sentence.

Ex Output:
a lv and equipmenl silling on a console


Ex Input:
Sentence: 'a horse is on a big green field with tall buildings in the background'. Replace the letter 'i' with 'a' in the sentence.

Ex Output:

a horse as on a bag green faeld wath tall bualdangs an the background