from collections import defaultdict
i=0
dic = defaultdict(lambda: -1)
while i*i<=10**10:
    i+=1
    a = list(str(i*i))
    a.sort()
    if dic[tuple(a)] == -1:
        dic[tuple(a)] = i*i
    while len(a) <= 10:
        a=["0"]+a
        if dic[tuple(a)] == -1:
            dic[tuple(a)] = i*i
T= int(input())
for _ in range(T):
    N=int(input())
    a = list(str(N))
    a.sort()
    a = tuple(a)
    print(dic[a])