def palindromeIndex(s):
    # Write your code here
    for i in range(len(s)):
        reverse_s = len(s)-i-1
        if s[i] != s[reverse_s]:
            x = s[:i] + s[i+1:]
            y = x[::-1]
            if x != y:
                return reverse_s
            else:
                return i
            
    return -1