N=int(input())

ANS=N

S=list(str(N))

for i in range(len(S)):
    for j in range(len(S)):
        S[i],S[j]=S[j],S[i]

        x="".join(S)
        ANS=max(ANS,int(x))

        S[i],S[j]=S[j],S[i]

print(ANS)