import sys
input = sys.stdin.readline

def palidrome(S):
    for i in range(len(S)):
        if S[i]!=S[len(S)-1-i]:
            return False
    return True


S=input().strip()

for i in range(len(S)):
    T=S+S[:i][::-1]

    if palidrome(T)==True:
        print(T)
        break