Programming in C for 89C51 example problem

[8051HELP]

I need to put on display NUMBER of elements in string which are less than 5.
SO i dont know how to put that result on display
HELP

byte string[16]={1,22,31,4,5,6,7,8,23,17,10,30,73,40,55,93};
byte i=0;
byte counter;
byte a;
byte xdata display _at_ 0x8002;
void Inic(void) {
	EA=1;
	ET0=1;
	TMOD=0x01;
	TH0=0x3C;
	TL0=0xAF;
	counter=20;
	i=0;
	TR0=1;
}

void timer0 (void) interrupt 1 using 2 {
 
 TH0=0x3C;
 TL0=0xAF;
 
if(counter==0) { counter=20;

 a= string[i];

  
 if(a<5) 
 display = a;
number++;
if(i==16) {i=0; }
i++;
}
counter--;
 TR0=0;
}

void main(void) {
 Inic();
 while(1){TR0=1;}
 }