def calc1(N):
    N = str(N)
    L = len(N)
    dp = [[[[0]*10 for _ in range(2)] for _ in range(2)] for _ in range(L+1)]
    dp[0][0][0][0] = 1
    
    for i in range(L):
        Ni = int(N[i])
        
        for j in range(2):
            for k in range(10):
                for d in range(10 if j else Ni+1):
                    if d!=1:
                        if d!=2:
                            dp[i+1][j|(d<Ni)][0][k] += dp[i][j][0][k]+dp[i][j][1][k]
                    
                        if d==2:
                            dp[i+1][j|(d<Ni)][0][k] += dp[i][j][0][k]
                            
                            if k+1<10:
                                dp[i+1][j|(d<Ni)][0][k+1] += dp[i][j][1][k]
                    else:
                        dp[i+1][j|(d<Ni)][1][k] += dp[i][j][0][k]+dp[i][j][1][k]
    
    res = 0
    
    for i in range(2):
        for j in range(2):
            for k in range(10):
                res += k*dp[L][i][j][k]
    
    return res

def calc2(N):
    N = str(N)
    L = len(N)
    dp = [[[0]*2 for _ in range(2)] for _ in range(L+1)]
    dp[0][0][0] = 1
    
    for i in range(L):
        Ni = int(N[i])
        
        if i==L-1:
            for j in range(2):
                for k in range(2):
                    if 2<=Ni or j==1:
                        dp[i+1][j|(2<Ni)][1] += dp[i][j][k]
                        
            continue
                        
        for j in range(2):
            for k in range(2):
                if k==0:
                    dp[i+1][j|(0<Ni)][0] += dp[i][j][k]
                
                    if 2<=Ni or j==1:
                        dp[i+1][j|(2<Ni)][1] += dp[i][j][k]
                else:
                    for d in range(10 if j else Ni+1):
                        dp[i+1][j|(d<Ni)][1] += dp[i][j][k]
    
    res = 0
    
    for i in range(2):
        for j in range(2):
            res += dp[L][i][j]
            
    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)