def palindrome(s):
    if s==s[::-1]:
        return True
    else:
        return False
        
def palindromeIndex(s):
    if s==s[::-1]:
        return -1
    else:
        for i in range(len(s)//2):
            a=i
            b=len(s)-i-1
            if s[a]!=s[b]:
                ns=s[:a]+s[a+1:]
                ns2=s[:b]+s[b+1:]
                if palindrome(ns):
                    return a
                if palindrome(ns2):
                    return b