python在线编程支持不行么

def ishui(x):
    n= len(x)
    for i in range(n//2):
        if x[i]!=x[n-1-i]:
            return False
    return True
 
def insertS(s):
    n=len(s)
    if n<=2:
        return True
    for i in range(n//2):
        if s[i]!=s[n-1-i]:
            return (ishui(s[:i]+s[i+1:]) or ishui(s[:n-1-i]+s[n-i:]))
    return True
try:
    while True:
        s=raw_input().strip()
        if not s:
            break
        if insertS(s):
            print("YES")
        else:
            print("NO")
except IOError as e:
    print ('errno:', e.errno)
    print(e)


题目：http://www.nowcoder.com/questionTerminal/655a43d702cd466093022383c24a38bf

本地通过，在线总是提示： 请检查是否存在数组越界非法访问等情况