def palindrome(sentence):
    if  sentence[-1] == sentence[-2]:
        sentence2 = sentence[::-1]
        sentence3 = sentence2[2:]
        new_sentence = sentence + sentence3
        print(new_sentence)



    else:
        sentence2 = sentence[::-1]
        sentence3 = sentence2[1:]
        new_sentence = sentence + sentence3
        print(new_sentence)







sentence = input("")
palindrome(sentence)