The third kindergarten class shakes out the sequence number of the sorting result at one time, and according to the sequence number of the sorting result, the number of 1-22 is admitted from small to large, starting from the 23rd as a backup; The middle shift shakes out 48 sorting result serial numbers at a time, and takes 1-44 in turn according to the sorting result serial numbers from small to large, and 45 is the standby.