题解 | #参数解析#

通过了13/15个测试例，希望有大佬帮忙解决bug。
while True:
try:
s=str(input())
maxlenth=0
i=0
half=0
c=1
while i+maxlenth<len(s):
while i+half<len(s) and s[i:i+1]!=s[i+1:i+2]:
i+=1
while i+half<len(s) and s[i-half:i+1]==(s[i+1:i+2+half])[::-1]:
half+=1
maxlenth=2*half
i+=(half+1)
print(maxlenth)
except:
break