Problema B: Blackboard Game

Code (Solución)

# | competition: "ICPC Latin American Regional – 2023"
# | problem_id: "B"
# | title: "Blackboard Game"

from collections import Counter

N = int(input())
ls = sorted(map(int, input().split()), reverse=True)
if all(v % 3 == 0 for k, v in Counter(ls).items()):
    print("N")
    exit()
print("Y")