from itertools import product

def check(s):
    print("Check starting", len(s))
    i = 0
    arr = []
    while (i < len(s)):


        if ((2*int(s[i][0]) + int(s[i][1]) + 2*int(s[i][2]) + int(s[i][3]))%3 == 0) and \
            ((int(s[i][0]) + int(s[i][1]) + 2*int(s[i][2]) + 2*int(s[i][3]))%3 == 0):
                arr.append(s[i])
        i += 1
    return arr

def main():
    print("In")
    arr = list(map("".join, product("012", "012", "012", "012")))
    print("Arr made,", arr[1])
    print(check(arr))

main()