PROGRAMMING:Simple loop structure: output all possible numbers of chickens and rabbits.

The total number of chickens and rabbits is given from the keyboard, showing all possible numbers of chickens and rabbits.
###Input format:
Enter an integer within 100（ Regardless of illegal input)
###Output format:
The line shows all possible number combinations of chickens and rabbits.
###Input example:
```in
four
```
###Output example:
The corresponding output is given here. For example:
```out
sum is 4, then perhaps:
rabbits=1,chickens=3
rabbits=2,chickens=2
rabbits=3,chickens=1
```







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