D={}
for i in range(1,10**5+1):
  S=i**2 
  T=[]
  for s in str(S):
    T.append(s)
  T=sorted(T)
  S=''.join(T)
  for j in range(10):
    if S not in D:
      D[S]=i**2
    S='0'+S 
    if len(S)>10:
      break

T=int(input())
for _ in range(T):
  A=[]
  S=input()
  for s in S:
    A.append(s)
  A=sorted(A)
  x=''.join(A)
  if x in D:
    print(D[x])
  else:
    print(-1)