PROGRAMMING:Input and output exercise: print the four most common data type keywords of C language, separated by spaces.

Please print the keywords corresponding to the four most common data types in C language, separated by spaces.
###Input format:
No input.
###Output format:
Four keywords are separated by spaces.
Input example:
Here is a set of inputs. For example:
```in
```
###Output example:
The corresponding output is given here. For example:
```out
int float double char
```







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