import sys
from collections import deque, Counter
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 63 - 1
mod = 998244353

a = input()
n = len(a)

for i in range(n):
    a2 = a + a[:i][::-1]
    if a2 == a2[::-1]:
        print(a2)
        exit()