子函数允许任意长度的被加数，被加数和结果都是字符串，可以直接输出。

Subroutine allow arbitrary length summand, summand, and the result is a string, you can output directly.

youdao

子函数允许任意长度的被加数，被加数和结果都是字符串，可以直接输出。

Subroutine allow arbitrary length summand, summand, and the result is a string, you can output directly.

youdao