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A = input()[::-1]
B = input()[::-1]
C = input()[::-1]

n = len(A)

d = 0
counter = 0
ans = 0
for i in range(n):
    a = int(A[i])
    b = int(B[i])
    c = int(C[i])

    if (a + b + d)%10 == c:
        d = (a + b + d)//10
        if d == 0:
            counter += 1
    else:
        ans += counter*(counter + 1)

        d = 0
        counter = 0
        if (a + b)%10 == c:
            d = (a + b)//10
            counter = int(d == 0)

ans += counter*(counter + 1)

print(ans//2, end="")