uart+lcd

hello dear all,
I have a problem in showing hex packet on LCD.I send a hex file by UART and i want to show it on LCD. but LCD show different number. like : i send 02 but it show 202. I taught maybe it's because of baud rate but it isn't work still. could you tell me what's the problem?
i use keil and my ARM is LPC1768

#include <LPC17xx.H>                                              definitions
#include "LCD.h"
#include "string.h"
#include "sys.h"
#include "lcd.h"
#include "touch.h"
#include "exti.h"
#include <stdio.h>
#include "uart.h"
unsigned char lcd_buf[50];
unsigned char s[10];

void Delay (uint32_t Time)
{
    uint32_t i;

    i = 0;
    while (Time--) {
        for (i = 0; i < 5000; i++);
    }
}





/*
*********************************************************************************************************
* Description:  The function is setting font colors¡¢brush colors and the area of clear
* Arguments  :  None
* Returns    :  None
*********************************************************************************************************
*/

void Load_Drow_Dialog(void)
{
        LCD_Clear(WHITE);
        POINT_COLOR=Red;                                                                        //Setting font colors
        LCD_ShowString(216,0,"txt");                                          //Displaying screen clear area
        POINT_COLOR=BLUE;                                                                       //Setting brush color
}
/*
*********************************************************************************************************
* Description:  Main function
* Arguments  :  None
* Returns    :  None
*********************************************************************************************************
*/
int main (void)
{
 int i=0;
  int j=0;
  SystemInit();

  LCD_Init();
Load_Drow_Dialog();
UART2_Init();
        while(1){
                for(i=0;i<7;i++){
                s[i]=UART2_GetChar()-190;
                }

                sprintf(lcd_buf,"%d-%d-%d-%d",s[3],s[4],s[5],s[6]);
                LCD_ShowString(40,60,lcd_buf );

    Delay(4000);
        }
}