l = int(input())
if l>0:
    l=str(l)
    l=list(l)
    l.reverse()
    a=len(l)
    if l[0]=="0":
        b=1
    else:
        b=0
    for  i in range(b,a):
        print(l[i],end="")
elif l<0:
    l=str(l)
    l=list(l)
    a=len(l)
    l=l[1:a]
    l.reverse()
    print("-",end="")
    if l[0]=="0":
        b=1
    else:
        b=0
    for i in range(b,a-1):
        print(l[i],end="")
elif l==0:
    print("0")