void ABCD ()
{
     int A;
     int B;
     int C;
     int D;
     
     for (A = 1; A <= 9; A++)
         {
         for (B = 1; B <= 9; B++)
             {
             for (C = 1; C <= 9; C++)
                 {
                 for (D = 1; D <= 9; D++)
                    {
                    if ( pow(A,B) * pow(C,D) == (A*1000 + B*100 + C*10 + D))
                    //if ((A^B)*(C^D) == ((A*1000)+(B*100)+(C*10)+D))
                       {
                             cout << A << "^" << B << "*" << C << "^" << D << "=";
                             cout << A << B << C << D << endl;
                       }
                     }
                 }
             }  
         }             
}