from collections import *
from itertools import *
from functools import *
import sys,math
input = sys.stdin.readline

A = list(input())[:-1]

N = len(A)
for i in range(N):
    
    tmp = A[:]
    Y = A[:i]
    Y.reverse()
    tmp = tmp + Y
    n = len(tmp)
    if all(tmp[i]==tmp[-1-i] for i in range(n)):
        print(''.join(tmp))
        exit()