defaultdict-tutorial

DefaultDict Tutorial ⬀

The defaultdict tool is a container in the collections class of Python. It's similar to the usual dictionary (dict) container, but the only difference is that a defaultdict will have a default value if that key has not been set yet. If you didn't use a defaultdict you'd have to check to see if that key exists, and if it doesn't, set it to what you want.

For example:

from collections import defaultdict
d = defaultdict(list)
d['python'].append("awesome")
d['something-else'].append("not relevant")
d['python'].append("language")
for i in d.items():
    print i

This prints:

('python', ['awesome', 'language'])
('something-else', ['not relevant'])

In this challenge, you will be given 2 integers, n and m. There are n words, which might repeat, in word group A. There are m words belonging to word group B. For each m words, check whether the word has appeared in group A or not. Print the indices of each occurrence of m in group A. If it does not appear, print -.

Example

Group A contains 'a', 'b', 'a' Group B contains 'a', 'c'

For the first word in group B, 'a', it appears at positions 1 and 3 in group A. The second word, 'c', does not appear in group A, so print -1.

Expected output:

1 3
-1

Input Format

• The first line contains integers, n and m separated by a space.
• The next lines contains the words belonging to group A.
• The next lines contains the words belonging to group B.

Constraints

• 1 ≤ n ≤ 10000
• 1 ≤ m ≤ 500
• 1 ≤ length of each word in the input ≤ 100

Output Format

Output m lines.

The iᵗʰ line should contain the 1-indexed positions of the occurrences of the iᵗʰ word separated by spaces.

Sample Input

STDIN   Function
-----   --------
5 2     group A size n = 5, group B size m = 2
a       group A contains 'a', 'a', 'b', 'a', 'b'
a
b
a
b
a       group B contains 'a', 'b'
b

Sample Output

1 2 4
3 5

Explanation

• 'a' appeared 3 times in positions 1, 2 and 4.
• 'b' appeared 2 times in positions 3 and 5.

In the sample problem, if 'c' also appeared in word group B, you would print -1.