from collections import defaultdict

t = int(input())
d = defaultdict(list)
for i in range(1, 100000):
    s = str(i*i)
    l = [0]*10
    for c in s:
        if int(c) != 0:
            l[int(c)] += 1
    d[tuple(l)].append(i)
for _ in range(t):
    n = int(input())
    lis = [0]*10
    for c in str(n):
        if int(c) != 0:
            lis[int(c)] += 1
    if tuple(lis) in d:
        print(min(d[tuple(lis)])**2)
    else:
        print(-1)