passu = raw_input()

def kaanna(passu):

    return passu[::-1]

def contains(passu,value):
    return passu.find(value)>-1

if passu == "":
    print 'Wrong amount of parameters!'

elif contains(passu," "):

    print 'Wrong amount of parameters!'
else:
    a = kaanna(passu)
    print '%s' %(a)