def find_mismatch(text):
    opening_brackets_stack = []
    for i, elm in enumerate(text):
        if elm in "([{":
            opening_brackets_stack.append([elm, i])

        if elm in ")]}":
            if elm == ")":
                elm = "("
            elif elm == "]":
                elm = "["
            else:
                elm = "{"
            try:
                if opening_brackets_stack.pop()[0] != elm:
                    return i + 1
            except:
                return i + 1
    if len(opening_brackets_stack) == 0:
        return "Success"
    else:
        return opening_brackets_stack[0][1] + 1


def main():
    text = input()
    r = find_mismatch(text)
    print(r)


if __name__ == "__main__":
    main()