num = [int(x) for x in input()]

def num_change():
    n_len = len(num)
    for i in range(n_len):
        tgt = big = num[i]
        index = 0
        for j in range(n_len-1,i,-1):
            if big<num[j]:
                big = num[j]
                index = j
        if tgt<big:
            num[index],num[i] = num[i],big
            return

num_change()
print("".join(map(str,num)))