#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd_skip() while(*rp++>=48)
#define rd_skip_line() while(*rp++!=10)
#define rd(v) long v=0;{long _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}
#define wt(v) {ulong _z=v;do*--wp=_z%10+48;while(_z/=10);}

typedef unsigned long ulong;
char s[1<<25];

long f1(){
	long n=read(0,s,200001)-1;
	long r=0,c='0';
	while(--n){
		if(s[n]!=c){
			++r;
			c=s[n-1];
		}
	}
	return r+1;
}

void f2(long r){
	char wbuf[64],*wp=wbuf+sizeof wbuf;
	wt(r);
	write(1,wp,wbuf+sizeof wbuf-wp);
	_exit(0);
}

int main(){
	f2(f1());
	return 0;
}