By Lewis Krauskopf, Ankika Biswas and Amruta Khandekar (Reuters) – Wall Street’s main indexes ended lower on Monday, with real estate and discretionary sectors leading broad declines, as investors digested comments from U.S. Federal Reserve officials about plans for interest rate hikes and looked for next catalysts after last week’s big stock market rally. Losses accelerated toward the end of the up-and-down session, with focus turning to Tuesday’s producer price index report and markets highly sensitive to inflation data. Earlier on Monday, Fed Vice Chair Lael Brainard signaled that the centr…