Автор - boxes2019
n = int(input())
m = int(input())
ans = 0
for i in range(m, n-1, -1):
buf = 0
for y in str(i)[1:]:
y = int(y)
if y%2==0 and y != 0:
buf += 1
if (y%4==0 and y!=0) or buf >= 2:
ans = i
break
if ans != 0:
print(i)
break