x = list(input())
x.sort(reverse=True)
y = sorted(x, reverse=True)
z_flag = False
las_ind = -1
if "0" in x:
    while not z_flag:
        if x[las_ind] == "0":
            las_ind -= 1
        else:
            z_flag = True
    x[las_ind], x[las_ind+1] = x[las_ind+1], x[las_ind]
    if x[0] == "0":print(-1)
    else:print("".join(x))
else:
    y[-1], y[-2] = y[-2], y[-1]
    if y[0] == "0" or x == y:
        print(-1)
    else:print("".join(y))