t = int(input())
C = [{} for _ in range(10)]
N = 10 ** 5
for i in range(1, N):
    now = i * i
    now = str(now)
    cnt = now.count("0")
    L = [j for j in now if j != "0"]
    L.sort()
    L = tuple(L)
    for j in range(cnt, 10):
        if not L in C[j]:
            C[j][L] = int(now)
        else:
            C[j][L] = min(C[j][L], int(now))
for _ in range(t):
    n = int(input())
    cnt = str(n).count("0")
    L = [j for j in str(n) if j != "0"]
    L.sort()
    L = tuple(L)
    if L in C[cnt]:
        print(C[cnt][L])
    else:
        print(-1)