#!/usr/bin/env python
# coding: utf-8

def ri():
    return int(input())

def rl():
    return list(input().split())

def rli():
    return list(map(int, input().split()))

def solve(x):
    last = x[-1]
    for i in range(len(x)-2, -1, -1):
        if x[i] == last:
            continue
        if i == 0 and last == '0':
            return -1
        return "".join(x[:i]+[x[i+1]]+[x[i]]+x[i+2:])
    return -1

def main():
    x = list(input())
    x.sort(reverse=True)
    # print(x)
    ans = solve(x)
    print(ans)


if __name__ == '__main__':
    main()