# your code goes here
def reverse_string(str,a):
# n = len(str)
# i =0
# while(i <=n-1):
# print(str[n-1-i],end = "")
# i = i+1
# print()
# for i in range(n):
# print(str[n-1-i], end = "")
# print()
if (a<0):
return
print(str[a], end = "")
reverse_string(str, a-1)
str = input()
n = len(str)
a = n-1
reverse_string(str,a)
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCgoKZGVmIHJldmVyc2Vfc3RyaW5nKHN0cixhKToKCSMgbiA9IGxlbihzdHIpCgkjIGkgPTAKCSMgd2hpbGUoaSA8PW4tMSk6CgkjIAlwcmludChzdHJbbi0xLWldLGVuZCA9ICIiKQoJIyAJaSA9IGkrMQoJCQoJIyBwcmludCgpCQoJIyBmb3IgaSBpbiByYW5nZShuKToKCSMgCXByaW50KHN0cltuLTEtaV0sIGVuZCA9ICIiKQoJCQoJIyBwcmludCgpCglpZiAoYTwwKToKCQlyZXR1cm4KCQoJcHJpbnQoc3RyW2FdLCBlbmQgPSAiIikKCXJldmVyc2Vfc3RyaW5nKHN0ciwgYS0xKQoJCgkKCQoJCnN0ciA9IGlucHV0KCkKbiA9IGxlbihzdHIpCmEgPSBuLTEKCnJldmVyc2Vfc3RyaW5nKHN0cixhKQ==