import collections
n = int(input())
m = int(input())
k = int(input())
s = []
ans = set()
if(m >= n):
    for i in range(n):
        s.append(input())
    cnt = collections.Counter(s)
    for i in set(s):
        if(cnt[i] >= k):
            print(i)
else:
    for i in range(m):
        s.append(input())
    ipst = collections.Counter(s)
    ans.update(set([i for i in ipst.keys() if ipst[i] >= k]))
    for i in range(n - m):
        s.append(input())
        ipst += collections.Counter([s[-1]])
        ipst[s[0]] -= 1
        if (ipst[s[-1]] >= k):
            ans.add(s[-1])
        s.pop(0)
    for i in sorted(list(ans), key=str.lower):
            print(i)