题解 | #MP3光标位置#

while True:
    try:
        n = int(input())
        actions = input()
        songs = [i for i in range(1,n+1)]
        new_songs =[]
        maus_pos = 0
        page_pos = 0  
        for act in actions:
            if act == 'U' and maus_pos == 0:
                maus_pos = n-1
                page_pos =3
            elif act == 'U':
                maus_pos -=1
                if page_pos==0:
                    page_pos = 0
                else:
                    page_pos -=1
            elif act == 'D' and maus_pos == n-1:
                maus_pos = 0
                page_pos = 0
            elif act == 'D':
                maus_pos += 1
                if page_pos == 3:
                    page_pos =3
                else:
                    page_pos +=1
        if n<=4:
            new_songs = songs
        else:
            value = songs[maus_pos]
            new_songs=[i for i in range(value-page_pos,value-page_pos+4)]            
        print(" ".join(list(map(str,new_songs))))
        print(songs[maus_pos])
    except:
        break