k=input(" Kalameh = ")
k=list(k)
l=len(k)
i=0
while(i<l):
    k[i]=ord(k[i])
    i+=1
c=0
while(c<l):
    if(65<=k[c]<=90):
        k[c]=k[c]+32
    c+=1
def mortab(a):
    l=len(a)
    b=["a" for x in range(l)]
    def maks(a):
        bish=a[0]
        l=len(a)
        c=0
        while(c<l):
            if(a[c]>bish):
                bish=a[c]
            c+=1
        return bish
    t=l
    while(t>0):
        z=maks(a)
        b[t]=z
        a.remove(z)
        t-=1
    return b
k=mortab(k)
p=0
while(p<l):
    k[p]=chr(k[p])
    p+=1
k="".join(k)
print(k)