Control C++ problem

Hello guys! I have a question for you and I'm sorry if I'm wasting your time.
I made a game in C++(I'm in high school so I don't know a lot of things).
My problem is that when I try to move my character in right it works if I press the key one time , but if I hold it , the character have a little bit of delay.
How can I remove that delay?

if(kbhit()){
  a=getch();
if((a=='A' && joc[hM-1][lM]!='*' && joc[hM-1][lM]!='#') || (a=='a' && joc[hM-1][lM]!='*' && joc[hM-1][lM]!='#')){
   joc[hM][lM]=' ';
   hM--;
   joc[hM][lM]=minge;}
else
  if((a=='D'  && joc[hM+1][lM]!='*' && joc[hM+1][lM]!='#') || (a=='d' && joc[hM+1][lM]!='*' && joc[hM+1][lM]!='#')){
    joc[hM][lM]=' ';
    hM++;
    joc[hM][lM]=minge;}

Code (markup):