uva :146 - ID Codes

#include<cstdio>
#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
int main()
{
    string s;
    while(cin >> s)
    {
        if(s=="#")break;
        int i,j,k,l,m,n,f=0;
        vector<char>v;
        for(i=0;i<s.length()-1;i++)
        {
            if(s[i]<s[i+1])
            {
                f=1;
            }
            v.push_back(s[i]);
        }
        v.push_back(s[i]);
        if(f==0)
        {
            cout << "No Successor" << endl;
        }
        else
        {
            next_permutation(v.begin(),v.end());
            for(i=0;i<v.size();i++)
            {
                printf("%c",v[i]);
            }printf("\n");
        }
    }
    return 0;
}