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

def find_first_target_idx():
    for i in range(n_size):
        cur = N[i]
        for j in range(i+1, n_size):
            if cur < N[j]:
                return i
    return -1

def find_second_target_idx(idx):
    for i in reversed(range(n_size)):
        if N[idx] < N[i]:
            return i

idx_1 = find_first_target_idx()

if idx_1 >= 0:
    idx_2 = find_second_target_idx(idx_1)
    N[idx_1], N[idx_2] = N[idx_2], N[idx_1]

print("".join(map(str, N)))