TLV decoding

key = input()
str = input().split(" ")
i = 0


while i < len(str):
    tag = str[i]
    length = int(str[i + 2] + str[i + 1], 16)
    value = ""
    for j in range(length):
        value += str[i+3+j]+" "
    i = i+3+length
    if key == tag:
        print(value)

Title Description ：
TLV The coding is according to [ Tag Length Value ] Format to encode , The cells in a code stream are Tag identification , Tag In the code stream The only one that doesn't repeat ,Length Represents a cell Value The length of ,Value Represents the value of the cell .
The code stream is in the form of a cell Tag start ,Tag Fixed occupation A byte ,Length Fixed occupation Two bytes , The byte order is Small end of the sequence .
Now given TLV Format coded code stream , And the cells that need to be decoded Tag, Please output... Of this cell Value.
Of the input bitstream 16 In hexadecimal characters , Excluding lowercase letters , And required output 16 Do not include lowercase letters in the hexadecimal string ;
The maximum length of the code stream string does not exceed 50000 Bytes .
Input description ：
The first line of input is a string , Represents... Of the cell to be decoded Tag ;
The second input behavior of a string , Indicates the to be decoded 16 Base stream , Use... Between bytes The blank space to separate .
Output description :
Output a string , Indicates the cell to be decoded in 16 In base notation Value .
Example 1 ：

Input
31
32 01 00 AE 90 02 00 01 02 30 03 00 AB 32 31 31 02 00 32 33 33 01 00 CC
1
2
Output
32 33
1
explain
Need to parse the cell Tag yes 31, Start matching from the beginning of the code stream ,
Tag by 32 The cell length of is 1（01 00, The small end order is expressed as 1）;
Of the second cell Tag yes 90, The length of 2;
Of the third cell Tag yes 30, The length of 3;
Of the fourth cell Tag yes 31, The length of 2（02 00）, So just return the last two bytes of the length , namely 32 33.