s = input()
if s.count('0') >= len(s)-1:
  res = -1
else:
  s1 = list(s)
  if len(set(s1)) == 1:
    res = -1
  else:
    s1.sort()
    sw = ''
    for i in range(len(s1)-1):
      if s1[i] != s1[i+1]:
        sw = s1[i]
        s1[i] = s1[i+1]
        s1[i+1] = sw
        break
      else:
        pass
    s1.reverse()
    res = ''.join(s1)
print(res)