\overline{AB} is a two-digit number, exchange tens and ones to get a new two-digit number \overline{BA}. It is known that \overline{AB}+\overline{BA}=x**2, then, how many \overline{AB} meet the conditions.
\overline{AB}是一个两位数，交换十位与个位的数字后得一新的两位数\overline{BA}．已知\overline{AB}+\overline{BA}=x**2，那么，符合条件的\overline{AB}共有多少个．
<result>8</result>