# 2021级《程序设计原理及C语言》练习题

J. Replace blanks

Write a program to copy its input to its output, replacing each string of one or more blanks by a single blank.

You can assume that the input string does not exceed $100$, only contains letters of both cases, digits, and white space.

### 样例

Input
a          a

Output
a a

Input
     a     a

Output
 a a


NaN