c语言如何用字符数组存超大的数

Problem Description
Given a big positive number x, please judge if it is odd.  
Input
Multi testcases.
For each testcase, a positive number x(1 <= x <= 1e20000) in a line.
Output
For each testcase, print "ODD" if it is odd, or print "EVEN"  
Sample Input
5
6
7
8

Sample Output
ODD
EVEN
ODD
EVEN