#include <iostream>
#include<string>
using namespace std;

int main()
{
    string username="123456";
    string password;
    int inputpassword;


for(int isAttempt = 0; isAttempt <=3; isAttempt++)
{
cout<<"Username:"<<endl;
cin>>username;
cout<<"Password:"<<endl;
cin>>password;

if(username != "123456" && password != "1234")
{
      cout<<"Invalid credential, the program terminates after 3 failed attempts"<<end;
}

if(username == "123456" && password == "1234")

{
    cout<<"Successful first login! Please change your password      immediately."<<endl;
    cout<<"New password must be 4-digit and different from the temporary password."<<endl;

}
while(inputpassword == password && inputpassword.lenght()==4)

{

  cout<<"New password must be 4-digit and different from the temporary   password."<<endl;
  cout<<"New password:"<<endl;
  cin>>inputpassword;

}

if(inputpassword != password && input.lenght()==4)
 {
    cout<<"You have changed your password successfully! Please re-login"<<endl;

  }
  else

  cout<<"access granted!"<<endl;







}

 return 0;
 }