from fractions import gcd
import math

mod = 998244353

def inverse(a):
    return pow(a, mod - 2, mod)


def usearch(x, a):
    lft = 0
    rgt = len(a) + 1
    while rgt - lft > 1:
        mid = (rgt + lft) // 2
        if a[mid] <= x:
            lft = mid
        else:
            rgt = mid
    return lft

def S(x1, y1, x2, y2, x3, y3):
    return heron(math.sqrt((x1 - x2)**2 + (y1 - y2)**2), math.sqrt((x1 - x3)**2 + (y1 - y3)**2), math.sqrt((x3 - x2)**2 + (y3 - y2)**2))

def heron(a, b, c):
    try:
        d = (a + b + c) / 2
        return round(math.sqrt(d * (d - a) * (d - b) * (d - c)) * 2)
    except Exception as e:
        return 0

def main():
    s = input()
    n = len(s)

    ans = 1
    i = 1
    while i < n:
        if s[i-1] == s[i]:
            i += 1
        ans += 1
        i += 1

    print(ans)

main()
