N = list(input())
A = ["".join(N)]
for i in range(len(N)-1):
    for j in range(i+1,len(N)):
        N[i],N[j] = N[j],N[i]
        a = "".join(N)
        A.append(a)
        N[i],N[j] = N[j],N[i]
A = sorted(A,reverse=True)
print(A[0])