f1=open('PLEASANT.INP','r')
f2=open('PLEASANT.OUT','w')
a=int(f1.readline())
b=int(f1.readline())
def dz(i):
i=str(i)
for j in range(len(i)-1):
if i[j]<i[j+1]:
return False
break
return True
s=0
for i in range(a,b+1):
if dz(i):
s+=1
print(s)