Python HackerRank|DefaultDict Tutorial(from collections import defaultdict)

1. Dashboard 
2.  Python 
3.  Collections 
4.  DefaultDict Tutorial
5. 1. from collections import defaultdict
      
      n, m = list(map(int, input().split()))
      d = defaultdict(list)
      
      for i in range(1,n+1):
          d[input()].append(i)
          
      for _ in range(m):
          char = input()
          if char in d:
              print(*d[char])
          else:
              print(-1)