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)



def check_palindrome(sentence):
    for i in range(len(sentence)):
        if sentence[i] == sentence[-(i + 1)]:
            pass

            
        else:
            palindrome(sentence)
            break
    
    else:
        print(sentence)
        

        
sentence = input("")
check_palindrome(sentence)