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import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String s = scanner.next();
        char[] chars = s.toCharArray();
        int len = chars.length;
        if(len < 3){
            System.out.println(((len+1)*len)/2);
            return;
        }
        List<Integer> list = new ArrayList<>();
        int sameLen = 1;
        char c = chars[0];
        for (int i = 1, j = 0; i < len; i++) {
            if (c == chars[i]) {
                sameLen++;
                if (sameLen >= 3) {
                    sameLen = 1;
                    list.add(j);
                    j++;
                    i = j;
                }
            } else {
                sameLen = 1;
                j = i;
                c = chars[j];
            }
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