Как заблокировать нажатие клавиш С++

#include <iostream>
#include <iomanip>
#include <ctime>
#include <cstdlib>
#include <conio.h>
using namespace std;
int board[4][4];
int dirLine[] = {1, 0, -1, 0};
int dirColumn[] = {0, 1, 0, -1 };
 
pair<int, int> generateUnoccupiedPosition() {
    int occupied = 1, line, column;
    while (occupied) {
         line = rand() % 4;
         column = rand() % 4;
        if (board[line][column] == 0)
            occupied = 0;
    }
    return make_pair(line, column);
}
void addPiece () {
    pair<int, int> pos = generateUnoccupiedPosition();
    board[pos.first][pos.second] = 2;
}
 
void newGame() {
    for (int i = 0; i < 4; ++i)
       for (int j = 0; j < 4; ++j)
         board[i][j] = 0;
    addPiece();
}
 
void printUI() {
    system("cls");
    setlocale(LC_ALL, "Russian");
    for (int i = 0; i < 4; ++i) {
        for (int j = 0; j < 4; ++j)
           if (board[i][j] == 0)
                cout << setw(4) << ".";
    else
        cout << setw(4) << board[i][j];
        cout << "\n";
    }
    cout<<"n: Новая игра, w: Вверх, s: Вниз, d: Вправо, a: Влево, q: Выход\n";
}
 
bool canDoMove(int line, int column, int nextLine, int nextColumn) {
    if (nextLine < 0 || nextColumn < 0 || nextLine >= 4 || nextColumn >= 4
        || (board[line][column] != board[nextLine][nextColumn] && board[nextLine][nextColumn] != 0))
        return false;
    return true;
}
 
void applyMove(int direction) {
    int startLine = 0, startColumn = 0, lineStep = 1, columnStep = 1;
    if (direction == 0) {
        startLine = 3;
        lineStep = -1;
    }
    if (direction == 1) {
        startColumn = 3;
        columnStep = -1;
    }
    int movePossible, canAddPiece = 0;
    do {
    movePossible = 0;
    for (int i = startLine; i >= 0 && i < 4; i += lineStep )
         for (int j = startColumn; j >= 0 && j < 4; j += columnStep) {
            int nextI = i + dirLine[direction], nextJ = j + dirColumn[direction];
            if (board[i][j] && canDoMove(i, j, nextI, nextJ)) {
                board[nextI][nextJ] += board[i][j];
                board[i][j] = 0;
                movePossible = canAddPiece = 1;
            }
         }
        printUI();
   } while (movePossible);
    if (canAddPiece)
        addPiece();
}
int main()
{
    srand(time(0));
    char commandToDir[128];
    commandToDir['s'] = 0;
 
    commandToDir['d'] = 1;
 
    commandToDir['w'] = 2;
 
    commandToDir['a'] = 3;
 
    newGame();
    while (true) {
        printUI();
        char command;
        cin >> command;
        if (command == 'n')
            newGame();
        else if (command == 'q')
            break;
        else {
            int currentDirection = commandToDir[command];
            applyMove(currentDirection);
        }
    }
    return 0;
}

else if (command=='s' || command=='d' || .... ) {