N=list(map(int,list(input())))
for i in range(len(N)):
    T=N[i:]
    x=max(T)
    if x==T[0]:continue
    for y in range(len(T))[::-1]:
        if T[y]==x:break
    for o in range(len(T)):
        if T[o]!=x:
            if y>o:T[y],T[o]=T[o],T[y]
            print(''.join([str(n) for n in N[:i]+T]))
            exit
else:
    print(''.join([str(n) for n in N]))
    exit