#include <cstdio>
#include <vector>
#include <cstring>

struct block {
	char x, y;
	int len, end;
};

const int N = 20005;
char s[N], t[N];
int n, m, t_block[N], s_block[N], dp[N];
std::vector<block> ss, tt;

void decomp(char *s, int n, int *s_block, std::vector<block> &blocks) {
	for (int i = 0; i + 1 < n;) {
		blocks.push_back({s[i], s[i + 1], 0});
		++i;
		int len = 1;
		do {
			s_block[i - 1] = blocks.size() - 1;
			++len;
			++i;
		} while (i < n && s[i] == s[i - 2]);
		blocks.back().len = len;
		blocks.back().end = i;
		--i;
	}
}

int main() {
	scanf("%s%s", s, t);
	n = strlen(s);
	for (int i = 0; t[i]; ++m) {
		t[m] = t[i];
		do {
			++i;
		} while (t[i] == t[i - 1]);
	}
	t[m] = 0;
	decomp(s, n, s_block, ss);
	decomp(t, m, t_block, tt);
	dp[0] = -1;
	int ans = 0;
	for (int i = 1; i < n; ++i) {
		bool ok = 1;
		int j, k;
		dp[i] = dp[i - 1];
		if (tt.empty()) {
			if (s[i] == t[0]) dp[i] = i;
		}
		else if (tt.size() == 1) {
			if ((tt.back().x != s[i - 1] || tt.back().y != s[i]) && (tt.back().y != s[i - 1] || tt.back().x != s[i])) continue;
			dp[i] = i - 1;
		} else {
			if (i == 1 || s[i] != s[i - 2]) {
				if (tt.back().x != s[i - 1] || tt.back().y != s[i]) continue;
				if (tt.size() > 1 && (i == 1)) continue;
				if (s_block[i - 2] < (int)tt.size() - 2) continue;
				for (j = (int)tt.size() - 2, k = s_block[i - 2]; j > 0 && ok; --j, --k) {
					if (tt[j].x != ss[k].x || tt[j].y != ss[k].y) ok = 0;
					if (tt[j].len < ss[k].len || (tt[j].len ^ ss[k].len) & 1) ok = 0;
				}
				if (ok) {
					if (s[ss[k].end - 1] != t[tt[0].end - 1] && s[ss[k].end - 2] != t[tt[0].end - 2]) ok = 0;
				}
			} else ok = 0;
			if (ok) {
				dp[i] = ss[k].end - 2;
			}
		}
	}
	for (int i = 0; i < n; ++i) ans += dp[i] + 1;
	printf("%d\n", ans);
	return 0;
}