# import heapq 
# from heapq import heappop,heappush,heapify
# from sys import stdin, setrecursionlimit
# input = stdin.readline
# readline = stdin.readline
# from collections import deque,defaultdict

#N,Q=map(int, input().split())
now='?'
N=int(input())
S=input()
c=0
for s in S:
  if now!=s:
    c+=1 
  now=s
print(c)