you give stre num represent large integer Return largestvalue odd integer string nonempty substre num string odd integer existsA substre contiguous sequence character string Example 1input num 52output 5explanation the nonempty substring 5 2 52 5 odd numberExample 2input num 4206output Explanation there odd number 4206example 3input num 35427output 35427explanation 35427 odd number Constraints1 numlength 105num consist digit contain lead zero