a = list(input())

n = len(a)
for i in range(n):
  flg = True
  for j in range((n - i) // 2):
    if a[i + j] != a[n - 1 - j]:
      flg = False
      break

  if flg:
    print(''.join(a + list(reversed(a[0:i]))))
    exit()