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#include <cstdio>
#include <cstring>

static unsigned char x[1000001];
static unsigned char y[1000001];
static unsigned char z[1000001];
static unsigned long long mem[1000000][2];

int main(void)
{
	unsigned n;
	fgets((char *) x, sizeof(x), stdin);
	fgets((char *) y, sizeof(y), stdin);
	fgets((char *) z, sizeof(z), stdin);
	n = strlen((const char *) x) - 1;
	for (unsigned i = 0; i < n; i++) {
		x[i] -= '0';
		y[i] -= '0';
		z[i] -= '0';
	}
	for (unsigned i = 0; i < n; i++) {
		for (unsigned c = 0; c <= 1; c++) {
			unsigned v = x[i] + y[i] + c;
			if (v % 10 == z[i]) {
				unsigned cn = v >= 10;
				if (!cn)
					mem[i][c]++;
				if (i)
					mem[i][c] += mem[i - 1][cn];
			}
		}
	}
	unsigned long long wynik = 0;
	for (unsigned i = 0; i < n; i++)
		wynik += mem[i][0];
	printf("%llu\n", wynik);
	return 0;
}