BOJ - 9661 - 돌 게임 7

def solution():
    N = int(input())
    if ((N - 1) % 5 + 1) == 2 or ((N - 1) % 5 + 1) == 5: print('CY')
    else: print('SK')
solution()

https://www.acmicpc.net/problem/9661