# -*- coding: utf-8 -*-

import sys

def input(): return sys.stdin.readline().strip()
def list2d(a, b, c): return [[c] * b for i in range(a)]
def list3d(a, b, c, d): return [[[d] * c for j in range(b)] for i in range(a)]
def list4d(a, b, c, d, e): return [[[[e] * d for j in range(c)] for j in range(b)] for i in range(a)]
def ceil(x, y=1): return int(-(-x // y))
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(N=None): return list(MAP()) if N is None else [INT() for i in range(N)]
def Yes(): print('Yes')
def No(): print('No')
def YES(): print('YES')
def NO(): print('NO')
sys.setrecursionlimit(10 ** 9)
INF = 10 ** 18
MOD = 10 ** 9 + 7

A = list(map(int, input()))
N = len(A)

if len(set(A)) == 1:
    print(-1)
    exit()

A.sort(reverse=1)
for i in range(N-2, -1, -1):
    if A[i] != A[i+1]:
        A[i], A[i+1] = A[i+1], A[i]
        break
else:
    print(-1)
    exit()

if A[0] == 0:
    print(-1)
else:
    print(''.join(map(str, A)))