题解 | #MP3光标位置#

# 每屏显示4首歌，光标初始位置为第1首歌

N=int(input())  # 歌曲数量
order=input()   # 命令 U 往上/D 往下
n=4             # 每屏显示歌曲数量
cursor=1        # 光标初始位置为第1首歌

if N<=4:
    present_list=[i for i in range(1,N+1)]
    for i in order:
        if i=='U':
            if cursor==1:
                cursor = N
            else:
                cursor -= 1
        elif i=='D':
            if cursor==N:
                cursor = 1
            else:
                cursor += 1

else:
    present_list=list(range(1,n+1))
    for i in order:
        if i=='U':
            if cursor==1:
                cursor = N
            else:
                cursor -= 1
        elif i=='D':
            if cursor==N:
                cursor = 1
            else:
                cursor += 1

        if cursor==N:
            present_list=list(range(N+1-n,N+1))
        elif cursor==1:
            present_list=list(range(1,n+1))
        elif min(present_list)<=cursor<=max(present_list):
            present_list=present_list
        elif cursor<min(present_list):
            present_list=list(map(lambda i:i-1,present_list)) 
            # present_list 每个值减1
        elif cursor>max(present_list):
            present_list=list(map(lambda i:i+1,present_list))
            # present_list 每个值加1

for i in present_list:
    print(i,end=' ')
print()   
print(cursor)