new numbers_player[5];
if(sscanf(inputtext, "d,d,d,d,d", numbers_player[0], numbers_player[1], numbers_player[2], numbers_player[3], numbers_player[4]))
    return ...;

new numbers_player[5];
if(sscanf(inputtext, "p<,>a<d>[5]", numbers_player))
    return SendClientMessage(playerid, -1, "Niepoprawna warto??");

for(new i = 0; i < sizeof(numbers_player); i++)
{
    for(new x = 0; x < sizeof(numbers_player); x++)
    {
         if(i != x && numbers_player[i] == numbers_player[x])
         {
              return SendClientMessage(playerid, -1, "Warto?? nie mo?e si? powtarza?");
         }
    }
}