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def solution(n, words):
    answer = []
    dic={}
    for i in range(len(words)-1):
        if words[i][-1]!=words[i+1][0]:
            return [((i+1)%n)+1,((i+1)//n)+1]
        elif words[i] in dic:
            return [(i%n)+1,(i//n)+1]
        else:
            dic[words[i]]=1
    if words[-1] in dic:
        return [((len(words)-1)%n)+1,((len(words)-1)//n)+1]
    return [0,0]