SAO PAULO, Oct 30 (Reuters) - Luiz Inacio Lula da Silva narrowly defeated President Jair Bolsonaro in a runoff election on Sunday that marked a stunning comeback for the leftist former president and the end of Brazil's most right-wing government in decades.The vote was a rebuke for the fiery far-right populism of Bolsonaro, who emerged from the back benches of Congress to forge a novel conservative coalition but lost support as Brazil ran up one of the worst death tolls of the coronavirus pandemic.Bolsonaro remained silent on Sunday night after the results were announced and some of his allies publicly acknowledged his defeat, defying expectations that he might immediately challenge the narrow result after making baseless claims of fraud in previous elections.Lula said in a speech he would unite a divided country and ensure that Brazilians "put down arms that never should have been taken up," while inviting international cooperation to preserve the Amazon rainforest and make global trade more fair.However, his Workers Party was later tarred by a deep recession and a record-breaking corruption scandal that jailed him for 19 months on bribery convictions, which were overturned by the Supreme Court last year."