Jumpity Digits

#include<bits/stdc++.h>
using namespace std;

int main()
{

    string num;

    cin>>num;

    string temp = num;
    int len= num.size();

    int c=0;
    for(int i=len-1; i>=0; i--)
    {
        for(int j=i-1; j>=0; j--)
        {

            if((num[i]-'0')<(num[j]-'0'))
            {

                swap(num[i],num[j]);
                c++;
                break;
            }
        }
        if(c==1) break;
    }
    if(c==1 && (num[0]-'0')!=0)
        cout<<num<<endl;
    else
        cout<<-1<<endl;

}