Task: Program Execution
Input (English): Sentence: 'a clock with hands, on a pole showing 11:25, against bricked city walkway with pedestrians and several storied building behind'. Replace the letter 'b' with 'p' in the sentence.
Output (English): a clock with hands, on a pole showing 11:25, against pricked city walkway with pedestrians and several storied puilding pehind