// this solution without any type of container
#include<iostream>

typedef int usg_t;

int main()
{
	char x, y, z;
	usg_t dup{ 0 }, dupc{ 0 }, tria{ 0 }, dis{ 0 };
	// dup count for X...XX // tria count for XOX // dis count for XO .
	x = getchar(); y = getchar(); z = getchar();
	if ((x < 'a' || x > 'z') || (y < 'a' || y > 'z'))
		std::cout << 0, exit(0);
	else if (z < 'a' || z > 'z')
			std::cout << 1, exit(0);
	if (x == y)
	{
		if (x == z)
			dis ++, dup++, ++dupc;
		else dup++, dis += 2;
	}
	else {
		if (x == z)
			dis += 3, tria++;
		else if (y == z)
			dis += 2, dup++, dupc++;
		else
			dis += 3;
	}
	while (true)
	{
		x = y, y = z;
		z = getchar();
		if (z < 'a' || z > 'z')
			break;
		if (x == y) 
		{
			if (x != z)
				++dis;
		}
		else 
		{
			if  (x != z) 
			{
				if (y == z)
					++dup;
				else
					++dis;
			}
			else
				dis++, tria++;
		}
	}
	std::cout << ((dis * (dis - 1) / 2) + dup - tria) << std::endl;
	system("pause");
}