python面试题，输出第1个不重复的字符

# -*- coding: utf-8 -*-
class wanwan(object):
    def wanwan(self):
        str1="abosdufouwgeifubw"
        for i in str1:
            if str1.count(i)==1:
                print(i)
                break

if __name__ == '__main__':
    a=wanwan()
    a.wanwan()