DefaultDict Tutorial

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    from collections import defaultdict d = defaultdict(list) list1=[]

    n, m = map(int,input().split())

    for i in range(0,n): d[input()].append(i+1)

    for i in range(0,m): list1=list1+[input()]

    for i in list1: if i in d: print(" ".join( map(str,d[i]) )) else: print(-1)