A Custom Container

Lab Python Advanced 30 points

Create Playlist that stores songs and supports len(), indexing (p[0]), in and iteration. Read songs, then a song to look for; print the length, the first and last song, whether the searched song is in the playlist, and all songs numbered.

Input

Line 1: songs separated by commas. Line 2: a song title.

Output

Several lines.

Example

Input

Yellow, Clocks, Fix You
Clocks

Output

3
Yellow
Fix You
True
1. Yellow
2. Clocks
3. Fix You

Sample input available Sample output available

Editor

Python

Hints

__getitem__ powers p[i]; __contains__ powers in; __iter__ powers for loops.

Solution explanation

Implementing these methods makes your class behave like a built-in sequence.

Show solution

class Playlist:
    def __init__(self, songs):
        self._songs = list(songs)

    def __len__(self):
        return len(self._songs)

    def __getitem__(self, index):
        return self._songs[index]

    def __contains__(self, song):
        return song in self._songs

    def __iter__(self):
        return iter(self._songs)


p = Playlist(s.strip() for s in input().split(","))
wanted = input()
print(len(p))
print(p[0])
print(p[-1])
print(wanted in p)
for i, song in enumerate(p, 1):
    print(f"{i}. {song}")

Output

Answer