from collections import defaultdict
d = defaultdict(int)
T = int(input())
se = set()
def num_sort(x):
    li = []
    for c in str(x):
        li.append(int(c))
    li.sort()
    li = li[::-1]
    ret = 0
    for i in li:
        ret = 10 * ret + i
    return ret
for n in range(1, 10 ** 5):
    val = num_sort(n * n)
    if val not in d:
        d[val] = n * n
    else:
        d[val] = min(d[val], n * n)
for _ in range(T):
    N = input()
    val = num_sort(N)
    ans = -1
    while True:
        if val in d:
            if ans == -1:
                ans = d[val]
            else:
                ans = min(ans, d[val])
        if val % 10 != 0:
            break
        val /= 10
    print(ans)