Wrote this before seeing the answer, and made some parts a bit harder just to test myself remembering.
#include <iostream>
#include <string>
using namespace std;
int main()
{
// Introduce the game
constexpr int WORD_LENGHT = 5;
cout << endl;
cout << "Welcome to Bulls and Cows; a fun word game." << endl;
cout << "Can you guess the " << WORD_LENGHT << " letter isogram I'm thinking of?\n";
cout << endl;
// Get a guess from the player
string Guess = "";
cout << "Enter you guess by typing in a " << WORD_LENGHT << " letter word:\n";
cout << endl;
cin >> Guess;
cout << endl;
// Repeat the guess back to them
cout << "You said: " << Guess; cout << ".\nLet's check if you are right..\n" << endl;
cout << endl;
return 0;
}