import sys
input=lambda: sys.stdin.readline().rstrip()
import collections
X=collections.Counter(list(input()))
if len(X.keys())==1:
  print(-1)
else:
  ans=""
  A=sorted(list(X.keys()))
  ans+=str(A[0])*(X[A[0]]-1)+str(A[1])+str(A[0])+str(A[1])*(X[A[1]]-1)
  for i in range(2,len(A)):
    ans+=str(A[i])*X[A[i]]
  ans=ans[::-1]
  if ans[0]=="0":
    print(-1)
  else:
    print(ans)