92, 85, 78, 71... According to this rule, what is the fifth number
92，85，78，71…按这样的规律，第五个数是多少
<gadget id="calculator">92 - 85</gadget>
<output>7</output>

<gadget id="calculator">71 - 7</gadget>
<output>64</output>

<result>64</result>