Count the number of segments in a string, where a segment is defined to be a contiguous sequence of non-space characters.

计算字符串中的段数，其中段定义为非空格字符的连续序列。

Please note that the string does not contain any non-printable characters.

请注意，该字符串不包含任何不可打印的字符。

Example:

Input: "Hello, my name is John"
Output: 5