Please convert this acm code by using only class....i have no idea about c++ or object oriented programming.can u help me to get the solution?

#include <stdio.h>
#include <algorithm>

using namespace std;

int main ()
{
    char A [100], Len;

    while (scanf ("%s", A )) {

        if ( A [0] == '#' )
            break;

        Len = strlen (A);

        if (next_permutation (A, A + Len) )
            printf("%s\n", A);
        else
            printf("No Successor\n");
    }

    return 0;
}