def reverse(n):
if n == 0:
return 0
sign = 1
if n < 0:
sign = -1
n = abs(n)
reversed_num = 0
while n > 0:
reversed_num = reversed_num * 10 + n % 10
n //= 10
return sign * reversed_num
N = int(input("请输入一个整数N"))
result = reverse(N)
print(f"反转后的新数为{result}")
