Given a number N as the input, print the
largest even number E that can be formed using the digits present in the
number. (There will be at least one even digit).
Input
Format:
The first line contains N.
Output
Format:
The first line contains E.
Example
Input/Output 1:
Input:
1902
Output:
9210
Solution:
n=list(input())
e=min(filter(lambda
x:(ord(x)-ord('0'))%2==0,n))
n.remove(e)
n.sort(reverse=True)
n.append(e)
print(''.join(n))