2864. Maximum Odd Binary Number

class Solution:
    def maximumOddBinaryNumber(self, s: str) -> str:
        ones = []
        zeros = []
        for c in s:
            if c == '0':
                zeros.append(c)
            else:
                ones.append(c)

        zeros = ''.join(zeros)
        ones = ''.join(ones)
        if len(ones) > 1:
            res = ones[1:] + zeros + '1'
            return res
        
        return zeros + ones

class Solution:
    def maximumOddBinaryNumber(self, s: str) -> str:
        cnt = s.count("1")
        return "1" * (cnt - 1) + (len(s) - cnt) * "0" + "1"