#include <iostream>

using namespace std;

int main () {
    char choice;

while(true) {
    cout << "Do you want to enter? (Y/N): ";
    cin >> choice;

    if(choice=='y'||choice=='Y') {
        cout << "Welcome!" << endl;
    }
    else break;
}

cout << "OK bye.." << endl;

    return 0;
}