N = int(input())
x = 0
if(N>0):
    while(N!=0):
        a = N % 10
        x = 10*x + a
        N = N//10
    print(x)
    
elif(N<0):
    N *= -1
    while(N!=0):
        a = N % 10
        x = 10*x + a
        N = N//10
    print(-x)

else:print (0)