题解 | #MP3光标位置#注意跟踪一下当前屏幕的第一首歌曲

while True:

try:
    n = int(input())
    str_input = input()
    # 总数小于等于4时
    if n <= 4:
        # 当前选中歌曲
        now = 1
        for c in str_input:
            if c == 'U':
                if now == 1:
                    now = n
                else:
                    now -= 1
            if c == 'D':
                if now == n:
                    now = 1
                else:
                    now += 1
        print(' '.join([str(i) for i in range(1, n + 1)]))
        print(now)
    else:
        # 总数大于4时
        # 当前选中歌曲
        now = 1
        # 当前屏幕第一首歌曲
        screen_first = 1
        for c in str_input:
            if c == 'U':
                if now == 1:
                    now = n
                    screen_first = n - 3
                elif now == screen_first:
                    now -= 1
                    screen_first -= 1
                else:
                    now -= 1
            if c == 'D':
                if now == n:
                    now = 1
                    screen_first = 1
                elif now == screen_first + 3:
                    now += 1
                    screen_first += 1
                else:
                    now += 1
        print(' '.join([str(i) for i in range(screen_first, screen_first + 4)]))
        print(now)
except:
    break