连续字母序列
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Description
给定一个小写字母，输出从小写“a”到这个字母，然后再到小写“a”的 序列
Input Format
一个小写字母ch
Output Format
从 "a" 到 ch 再到 "a" 的一个字母序列，具体看样例。
Sample
input
d
output
abcdcba
## Hint
时间限制：$1 \text {s}$
空间限制：$256 \text {MB}$
20200910-基础递归训练
- Status
- Done
- Rule
- ACM/ICPC
- Problem
- 10
- Start at
- 2020-9-13 15:29
- End at
- 2020-10-1 15:29
- Duration
- 432 hour(s)
- Host
-
admin
- Partic.
- 18
