N=list(input())
for i in range (len(N)):
    N[i]=int(N[i])
nd=0
i=0
M=N[i]
Mj=0
#int (M)
nd=0
while i<len(N) and nd==0:
    M=N[i]
    j=i+1
    while j<len(N):
        if (M<=N[j] and nd>0) or M<N[j]:
            M=N[j]
            Mj=j
            nd+=1
    #        print (Mj)
    #        print (i)
        j+=1
    i+=1
#rint (i)
if i!=len(N):
    t=N[i-1]
    N[i-1]=N[Mj]
    N[Mj]=t
#rint(N)
for i in range (len(N)):
    N[i]=str(N[i])
print ("". join (N))