n = list(map(int, input()))
now_max_i = len(n)-1

for i in range(len(n)-2,-1,-1):
    if n[now_max_i] < n[i]:
        now_max_i = i

n[now_max_i],n[0] = n[0], n[now_max_i]
print("".join(map(str, n)))