n = [x for x in input()]
max_num = max(n)
index_list = [x for x, s in enumerate(n) if s == max_num]
replace_index = index_list.pop()
replace_num = n[replace_index]
first_num = n[0]
n[0] = replace_num
n[replace_index] = first_num
n = int(''.join(n))
print(n)