POJ 1146 ID Codes——STL next_permutation

#include<iostream>
#include<cstdio>
#include<string>
#include<cstring>
#include<iomanip>
#include<algorithm>
#include<cmath>
using namespace std;
int main()
{
    string a;
    while(cin>>a && a!="#")
    {
        if(next_permutation(a.begin(),a.end()))
        {
            cout<<a<<endl;
        }
        else
            cout<<"No Successor\n";

    }
    return 0;
}