백준(BaekJoon)_9506_약수들의합

def func(num):
    answer = f"{num} = "
    factors = [i for i in range(1,num//2+1) if num % i == 0]
    if num == sum(factors):
        exp = " + ".join(map(str,factors))
        answer += exp
        return answer
            
    else:
        return f"{num} is NOT perfect."
     
            
if __name__ == "__main__":
    while True:
        num = int(input())
        
        if num == -1:
            break
            
        print(func(num))