package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func getNextString(scanner *bufio.Scanner) string {
	if !scanner.Scan() {
		panic("scan failed")
	}
	return scanner.Text()
}
func atoi(s string) int                             { x, _ := strconv.Atoi(s); return x }
func getNextInt(scanner *bufio.Scanner) int         { return atoi(getNextString(scanner)) }
func atoi64(s string) int64                         { x, _ := strconv.ParseInt(s, 10, 64); return x }
func getNextInt64(scanner *bufio.Scanner) int64     { return atoi64(getNextString(scanner)) }
func atof64(s string) float64                       { x, _ := strconv.ParseFloat(s, 64); return x }
func getNextFloat64(scanner *bufio.Scanner) float64 { return atof64(getNextString(scanner)) }
func main() {
	fp := os.Stdin
	wfp := os.Stdout
	extra := 0
	if os.Getenv("I") == "IronMan" {
		fp, _ = os.Open(os.Getenv("END_GAME"))
		extra = 100
	}
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
	writer := bufio.NewWriter(wfp)
	defer func() {
		r := recover()
		if r != nil {
			fmt.Fprintln(writer, r)
		}
		writer.Flush()
	}()
	solve(scanner, writer)
	for i := 0; i < extra; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
}
func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	s := getNextString(scanner)
	n := len(s)
	type pair [3]int
	var (
		l, r, m int
		mp      map[pair]bool
	)
	l = 0
	r = 2
	m = 1
	now := pair{0, 0, 0}
	mp = map[pair]bool{}
	mp[now] = true
	for i := 0; i < n; i++ {
		e := int(s[i] - 'a')
		if now[0] == 0 {
			switch e {
			case l:
				now = pair{1 - now[0], now[1], now[2] - 1}
				l, r, m = m, l, r
			case r:
				now = pair{1 - now[0], now[1], now[2] + 1}
				l, r, m = m, l, r
			case m:
				now = pair{1 - now[0], now[1] - 1, now[2]}
			}
		} else {
			switch e {
			case l:
				now = pair{1 - now[0], now[1], now[2]}
				l, r, m = m, l, r
			case r:
				now = pair{1 - now[0], now[1], now[2] + 1}
				l, r, m = m, l, r
			case m:
				now = pair{1 - now[0], now[1] + 1, now[2]}
			}
		}
		mp[now] = true
	}
	fmt.Fprintln(writer, len(mp))
}