used_ip = {}
curr_ip_list = []
ind_last_ip = 0
ans = set()
n = int(input())
m = int(input())
k = int(input())
if n >= m:
    for i in range(m):
        tmp_ip = input()
        curr_ip_list.append(tmp_ip)
        if used_ip.get(tmp_ip) is None:
            used_ip[tmp_ip] = 1
        else:
            used_ip[tmp_ip] += 1
        if used_ip[tmp_ip] >= k:
            ans.add(tmp_ip)
    for i in range(n - m):
        tmp_ip = input()

        # Dell last ip.
        used_ip[curr_ip_list[ind_last_ip]] -= 1
        curr_ip_list[ind_last_ip] = tmp_ip
        ind_last_ip = (ind_last_ip + 1) % m

        if used_ip.get(tmp_ip) is None:
            used_ip[tmp_ip] = 1
        else:
            used_ip[tmp_ip] += 1
        if used_ip[tmp_ip] >= k:
            ans.add(tmp_ip)
    print(*sorted(ans), sep='\n')