Task: Program Execution
Input (English): Sentence: 'an old boat is on the shore of a beach with nets, boxes, and other junk next to it and other beached boats in the background'. Replace the letter 't' with 'p' in the sentence.
Output (English): an old boap is on phe shore of a beach wiph neps, boxes, and opher junk nexp po ip and opher beached boaps in phe background