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

for i in range(len(N)):
    T=N[i:]
    if max(T)==T[0]:continue
    S=N[:i]
    x=max(T)
    for i in range(len(T))[::-1]:
        if T[i]==x:
            y=i
            break
    for i in range(len(T)):
        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]))
            exit()
else:
    print(''.join([str(x) for x in N]))
    exit()