N = int(input())
listN = list(str(N))
first = listN[0]
for i in range(1,len(listN)):
    flg = True
    second = listN[i]
    if first < second:
        flg = False
        break
    first = second
if flg:
    print(N)
    exit()
maxs = [i for i,x in enumerate(listN) if x == max(listN)]
id1 = maxs[0]
id2 = maxs[-1]
if len(maxs) > 1 and (id1 == id2 or id1 == 0):
    print(N)
else:
    listN[0],listN[id2] = listN[id2],listN[0]
    print(int("".join(map(str,listN))))