def calc1(N): N = str(N) L = len(N) res = 0 for l in range(L-1): dp = [[0]*2 for _ in range(L+1)] dp[0][0] = 1 for i in range(L): Ni = int(N[i]) for j in range(2): if i<l or i>l+1: for d in range(10 if j else Ni+1): dp[i+1][j|(d<Ni)] += dp[i][j] elif i==l and (1<=Ni or j==1): dp[i+1][j|(1<Ni)] += dp[i][j] elif i==l+1 and (2<=Ni or j==1): dp[i+1][j|(2<Ni)] += dp[i][j] res += dp[L][0]+dp[L][1] return res def calc2(N): N = str(N) L = len(N) res = 0 for l in range(L): dp = [[0]*2 for _ in range(L+1)] dp[0][0] = 1 for i in range(L): Ni = int(N[i]) for j in range(2): if i<l: dp[i+1][j|(0<Ni)] += dp[i][j] elif i==l and (2<=Ni or j==1): dp[i+1][j|(2<Ni)] += dp[i][j] elif l<i<L-1: for d in range(10 if j else Ni+1): dp[i+1][j|(d<Ni)] += dp[i][j] elif i==L-1 and (2<=Ni or j==1): dp[i+1][j|(2<Ni)] += dp[i][j] res += dp[L][0]+dp[L][1] return res A, B = map(int, input().split()) ans = calc1(B)-calc1(A-1)+calc2(B)-calc2(A-1) strA = str(A) if strA[0]=='2' and strA[-1]=='2': ans -= 1 print(ans)