------Input------ 20 1 2 3 4 5 6 7 8 9 10 10 9 8 7 6 5 4 3 2 1 5 ------Answer----- 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 10 9 8 7 6 ------Your output----- 5432112345678910109876