import fileinput

input = [int(i) for i in next(fileinput.input()).strip()]

def solve(n):
    global input

    for _ in range(n):
        new_input = []
        current = input[0]
        count = 0

        for c in input:
            if c == current:
                count += 1
            else:
                new_input.extend((count, current))
                current, count = c, 1

        new_input.extend((count, current))
        input = new_input

    print(len(input))

solve(40)
solve(10)