这样？
```python
N = int(input())
x = 0
y = N < 0
if (N < 0):
N = -N
while(N!=0):
a = N % 10
x = 10*x + a
N = N//10
if (y == 1):
x = -x
print(x)
```
by Zpair @ 2022-03-25 00:01:45
@[Rammer](/user/277543) 我觉得可以精简成这样：
```python
a=input()[::-1].lstrip('0')
if a=='':a='0'
if a[-1]=='-':a='-'+a[:-1]
print(a)
```
by Terrible @ 2022-03-25 01:00:48
@[Zpair](/user/163337) 确实··· 完全可以提前转化负数，省的费大篇幅再写一遍函数······
by Rammer @ 2022-03-25 09:47:10
@[Terrible](/user/195942) 好精简！这就去研究研究
by Rammer @ 2022-03-25 09:47:44