a = input()
n = len(a)

t = 10 ** 9
ans = ""

for i in range(n+1):
	v = a[:i]
	w = v[::] + v[::-1]
	if len(w) < n: continue
	if w[:n] == a:
		if len(w) < t:
			t = len(w)
			ans = w
	
for i in range(1, n+1):
	v = a[:i]
	w = v[:-1] + v[-1] + v[:-1][::-1]
	if len(w) < n: continue
	if w[:n] == a:
		if len(w) < t:
			t = len(w)
			ans = w

print(ans)