N = int(input())
if N == 0:
    print(N)
else:
    m = abs(N)
    lst=[]
    while m != 0:
        lst.append(m%10)
        m = m//10
count = len(lst)
result = 0
for k in range(len(lst)):
    result = result + lst[k]*pow(10,count-1)
    count = count-1
if N <0:
    print(-result)
else:
    print(result)