BOJ(농구경기) 1159

1159 농구경기

d = {}
for i in range(int(input())):
    player = input()
    d[player[0]] = d.get(player[0], 0)+1
answer = []
for k, v in d.items():
    if v >= 5:
        answer.append(k)
print("".join(sorted(answer)) if answer else "PREDAJA")

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