There are 45 students in Class 5 1 of Sunshine Primary School, and 40 students in Class 5 2. During the tree planting activity, the two classes were divided into groups to plant trees. The number of people in each group of the two classes was the same.
阳光小学五1班有45人，五2班有40人，在植树活动中，给两班分组植树，两班每组人数相同，不准有剩余每组多少人．
<result>5</result>