PROGRAMMING:Vertical output string

This topic requires reading in a string with a width less than 20, and then output the input in the format of one character on one line.
###Input format:
Enter a string less than 20 wide.
###Output format:
For each group of input, the input is output in the format of one character on one line.
###Input example:
Here is a set of inputs. For example:
```in
Good!
```
###Output example:
The corresponding output is given here. For example:
```out
G
o
o
d
!
```







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