A = input()

def check(S):
    i = 0
    j = len(S) - 1
    while i < j:
        if S[i] != S[j]:return False
        i +=  1
        j -= 1
    return True

for i in range(len(A) + 1):
    if check(A[i:]):
        print(A + A[:i][::-1])
        break