ds = [int(a) for a in input()]
n = len(ds)
max_ds = ds[:]
for i in range(n-1):
    for j in range(i+1, n):
        ds[i], ds[j] = ds[j], ds[i]
        if ds > max_ds:
            max_ds = ds[:]
        ds[i], ds[j] = ds[j], ds[i]
print(''.join(map(str, max_ds)))