dic = {}

for i in range(1,31700):
    x = i*i

    s = [0] * 10

    while x:
        s[x%10] += 1
        x //= 10

    stup = tuple(s)
    if stup not in dic:
        dic[stup] = i*i

TT = int(input())

for _ in range(TT):

    N = int(input())

    s = [0] * 10

    x = N
    while x:
        s[x % 10] += 1
        x //= 10

    for i in range(s[0]+1):
        s[0] = i
        stup = tuple(s)

        if stup in dic:
            print (dic[stup])
            break
    else:
        print (-1)