神奇数

#超时了
def divide(n):
    global digit
    while(n>0):
        digit.append(n % 10)
        n = n // 10
        
def isEqual(index, halfSum):
    global digit
    if(halfSum == 0):
        return True
    if((halfSum!=0 and index == len(digit)) or halfSum < 0):
        return False
    equal = (isEqual(index+1, halfSum - digit[index]) or isEqual(index+1, halfSum))
    return equal
    
global digit
ans = 0
l, r = map(int, input().split())
for num in range(l, r+1):
    digit = []
    divide(num)
    if(sum(digit) % 2 != 0 or len(digit) < 2):
        continue
    else:
        if(isEqual(0, sum(digit)//2)):
            ans += 1
print (ans)