[백준][Python] 10610번 30

n = input()
num =[]
cumsum = 0
for i in n:
    num.append(i)
    cumsum+=int(i)
if "0" not in num or cumsum % 3 !=0 :
    print(-1)
else :
    num.sort(reverse=True) 
    print("".join(num))