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

Sentence: 'a man is standing on a snowboard, atop a mountain'. Replace the letter 'd' with 'u' in the sentence.
a man is stanuing on a snowboaru, atop a mountain

Sentence: 'little tubs of rice and mixed vegetables for a meal'. Replace the letter 't' with 'z' in the sentence.
lizzle zubs of rice and mixed vegezables for a meal

Sentence: 'young boy in blue holding a tennis racket in front of face'. Replace the letter 'i' with 'j' in the sentence.

young boy jn blue holdjng a tennjs racket jn front of face