a = input()
t = []
t1 = []
s = ‘’
for x in range(len(a)):
t.append(a[x])
for y in range(len(t) - 1,-1,-1):
t1.append(t[y])
for c in range(len(t1)):
s += str(t1[c])
print(s)
#能反转你所输入的任意字符串，最后输出的还是字符串