n = list(map(int, list(input())))

result = n
for i in range(len(n)):
    for j in range(i, len(n)):
        temp = n.copy()
        if n[i] <= n[j]:
            temp[i], temp[j] = temp[j], temp[i]
            if temp > result:
                result = temp

print(''.join(map(str, result)))