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#include <bits/stdc++.h>
using namespace std;
//{
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)
#define VAR(v, i) __typeof(i) v=(i)
#define all(v) (v).begin(),(v).end()
#define FORE(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)


#define PII pair<int,int>
#define st first
#define nd second
#define pb push_back
#define lint long long int
#define VI vector<int>

#define sim template < class c
#define ris return * this
#define dor > debug & operator <<
#define eni(x) sim > typename \
  enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
sim > struct rge { c b, e; };
sim > rge<c> range(c i, c j) { return rge<c>{i, j}; }
sim > auto dud(c* x) -> decltype(cerr << *x, 0);
sim > char dud(...);
struct debug {
~debug() { cerr << endl; }
eni(!=) cerr << boolalpha << i; ris; }
eni(==) ris << range(begin(i), end(i)); }
sim, class b dor(pair < b, c > d) {
  ris << "(" << d.first << ", " << d.second << ")";
}
sim dor(rge<c> d) {
  *this << "[";
  for (auto it = d.b; it != d.e; ++it)
	*this << ", " + 2 * (it == d.b) << *it;
  ris << "]";
}
};
//{
#define imie(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "

#define make( x) int (x); scanf("%d",&(x));
#define make2( x, y) int (x), (y); scanf("%d%d",&(x),&(y));
#define make3(x, y, z) int (x), (y), (z); scanf("%d%d%d",&(x),&(y),&(z));
#define make4(x, y, z, t) int (x), (y), (z), (t); scanf("%d%d%d%d",&(x),&(y),&(z),&(t));
#define makev(v,n) VI (v); FOR(i,0,(n)) { make(a); (v).pb(a);} 
#define IOS ios_base::sync_with_stdio(0)
#define HEAP priority_queue

#define read( x) scanf("%d",&(x));
#define read2( x, y) scanf("%d%d",&(x),&(y));
#define read3(x, y, z) scanf("%d%d%d",&(x),&(y),&(z));
#define read4(x, y, z, t) scanf("%d%d%d%d",&(x),&(y),&(z),&(t));
#define readv(v,n) FOR(i,0,(n)) { make(a); (v).pb(a);}
#define jeb() fflush(stdout);
//}


int n;
char s[300005];
lint ans = 0;

void jedna(int a, int b, int mid) {
	int left = mid;
	int right = mid;
	char C = s[mid];
	while (left-1 >= a && s[left-1] == C) left--;
	while (right+1 < b && s[right+1] == C) right++;
	ans += (mid - left+1) * 1LL * (right - mid);
}

void rozne(int a, int b, int mid, char C1, char C2) {
	char zle = 'a';
	while (zle == C1 || zle == C2) zle++;
	unordered_map<int, int> m1;
	int d1 = 0;
	for (int i = mid; i >= a; i--) {
		if (s[i] == zle) break;
		if (s[i] == C1) d1++;
		if (s[i] == C2) d1--;
		m1[d1]++;
	}
	d1 = 0;
	for (int i = mid+1; i < b; i++) {
		if (s[i] == zle) break;
		if (s[i] == C1) d1++;
		if (s[i] == C2) d1--;
		ans += m1[-d1];
	}
}

void dwie(int a, int b, int mid) {
	char C = s[mid];
	if (s[mid+1] != C) rozne(a,b,mid,C,s[mid+1]);
	else {
		for (char C2 = 'a'; C2 != 'd'; C2++) {
			if (C != C2) rozne(a,b,mid,C,C2);
		}
	}
}


lint code(int d1, int d2) {
	return (d1 + n) * 1LL * (2*n) + d2 + n;
}

void trzy(int a, int b, int mid) {
	map<lint, int> m1;
	int d1 = 0, d2 = 0;
	for (int i = mid; i >= a; i--) {
		if (s[i] == 'a') d1++,d2++;
		if (s[i] == 'b') d1--;
		if (s[i] == 'c') d2--;
		m1[code(d1,d2)]++;
	}
	d1 = 0, d2 = 0;
	for (int i = mid+1; i < b; i++) {
		if (s[i] == 'a') d1++,d2++;
		if (s[i] == 'b') d1--;
		if (s[i] == 'c') d2--;
		ans += m1[code(-d1,-d2)];
	}
}

void doit(int a, int b) {
	if (a >= b) return;
	if (b-a == 1) {
		ans += 1;
		return;
	}
	int mid = (a + b - 1) / 2;
	doit(a, mid+1);
	doit(mid+1, b);

	// zawierajace oba mid, mid+1
	jedna(a, b, mid);
	dwie(a, b, mid);
	trzy(a, b, mid);
}



int main() {
	scanf("%s", s);
	n = strlen(s);
	doit(0, n);
	printf("%lld\n", ans);
}