x, k = map(int, input().split())
x_str = str(x)
x_sorted = sorted(x_str)
if k == 0:
    if x_str[0] == x_sorted[-1]:
        print(x_str[0] * len(x_sorted))
    else:
        print(str(int(x_str[0]) + 1) * len(x_sorted))
else:
    print(x)