N=list(map(int,list(input())))

S=N
for i in range(len(N)):
    T=N[i:]
    if max(T)==T[0]:continue
    else:
        S=N[:i]
        break
else:
    print(''.join([str(x) for x in N]))
    exit()

x=max(T)
for i in range(len(T))[::-1]:
    if T[i]==x:y=i;break

for i in range(len(T)):
    tmp=T[i:]
    if max(tmp)==tmp[0]:continue
    if T[i]!=x:
        o=i
        if y>o:T[y],T[o]=T[o],T[y]
        print(''.join([str(x) for x in S+T]))
        break