PROGRAMMING:Reverse alphabetic string heboost

According to the size of input n (1 = < n < = 26), the corresponding inverted string is output.
###Input format:
Input format: 5
###Output format:
a b c d e d c b a
###Input example:
Here is a set of inputs. For example:
```in
five
```
###Output example:
The corresponding output is given here. For example:
```out
a b c d e d c b a
```







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