Onnenluku

a, b = list(map(lambda x : int(x), input().split()))

luvut = set()

def rec(luku, pari):
    if luku > b:
        return

    if luku >= a:
        if len(set(str(luku))) == 2:
            luvut.add(luku)
    
    rec(int(pari[0] + str(luku)), pari)
    rec(int(pari[1] + str(luku)), pari)

for i in range(10, 100):
    if i % 10 == 0:
        continue
    pari = set(str(i))
    if len(pari) > 2:
        continue
    elif len(pari) == 2:
        rec(i, (pari.pop(), pari.pop()))
    elif len(pari) == 1:
        eka = pari.pop()
        for j in range(1, 10):
            rec(i, (eka, str(j)))

print(len(luvut))

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 7

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 8

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 9

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 10

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 11

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 15

Group: 3

Verdict: TIME LIMIT EXCEEDED