def palin(x):
x = str(x)
for i in range(len(x)-1):
if x[i] == x[i+1]: return True
for i in range(len(x)-2):
if x[i] == x[i+2]: return True
return False
def dp(flag,prev,prev2,d):
if d==cur:
return 1
if dps[flag][prev][prev2][d] != -1:
return dps[flag][prev][prev2][d]
ans = 0
if flag:
for i in range(sus[d+1]+1):
if prev==10 and i==0: i = 10
if i==prev and i!=10: continue
if i==prev2 and i!=10: continue
if i==sus[d+1]:
ans += dp(1,i,prev,d+1)
else:
ans += dp(0,i,prev,d+1)
else:
for i in range(10):
if prev==10 and i==0: i = 10
if prev == i and i!=10: continue
if i==prev2 and i!=10: continue
ans += dp(0,i,prev,d+1)
dps[flag][prev][prev2][d] = ans
return ans
a,b = map(int, input().split())
sus = [-1]+[int(i) for i in str(a)]
cur = len(sus)-1
dps= [[[[-1 for i in range(19)]for i in range(11)]for i in range(11)]for i in range(2)]
aa = dp(1,10,10,0)
sus = [-1]+[int(i) for i in str(b)]
cur = len(sus)-1
dps= [[[[-1 for i in range(19)]for i in range(11)]for i in range(11)]for i in range(2)]
bb = dp(1,10,10,0)
if not palin(a):
aa -= 1
print(bb-aa)
