new guess; // use strtok and strval() to get the value, unless you arent using zcmd,dcmd or something like that
new number = random(10); // you can replace 10
if(guess == number)
{
    SendClientMessage(playerid,COLOR_GREEN,"Congrats! You won 1000$");
    GivePlayerMoney(playerid,1000);
}
else SendClientMessage(playerid,COLOR_GREEN,"No luck this time, please try again!