#include <math.h>
#include <stdlib.h>
#include <time.h>
#include <iostream>
using namespace std;

int main () {
   // Local variable declaration:
   char a, b, c, abc, f, g;

    srand(time(0));

   // do loop execution
   do {
    a='a' + rand()%7;
    b='b' + rand()%7;
    c='c' + rand()%7;
    cout<<"abc= "<<a<<b<<c<<endl;
   } while( a!=f || b!=a || c!=g );
        if(a!=f || b!=a || c!=g)


   return 0;
}