On the day of the art festival, the school exhibited the cut-and-paste works of students in each grade, among which 104 were not in the first grade, and 90 were not in the second grade. There were 38 pieces of works from the first and second grades. How many works from other grades were there? pieces?
艺术节那天，学校展览了每个年级学生的剪贴作品，其中有104件不是一年级的，有90件不是二年级的，一、二年级参展的作品共38件，其他年级参展的作品共有多少件？
<gadget id="calculator">90 - 38</gadget>
<output>52</output>

<gadget id="calculator">104 + 52</gadget>
<output>156</output>

<gadget id="calculator">156 / 2</gadget>
<output>78</output>

<result>78</result>