import os, sys
if os.path.exists("input.txt"):
  sys.stdin = open('input.txt', 'r')
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

def inp(): return readline().rstrip().decode('utf-8')
def inps(): return map(int, inp().split())

import itertools
inp()
S = inp()
print(len(list(itertools.groupby(S))))