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

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})
#define rd_skip() while(*rp++>=48)
#define rd() ({long _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})

int e[128];

int main(){
	rd_init();
	rd_skip();
	int m=rd();
	for(int d;d=*rp++,d>=32;){
		++e[d];
		if(e['A']<e['C']|m+e['W']<e['A']){
			write(1,"No",2);
			_exit(0);
		}
	}
	write(1,"Yes",3);
	_exit(0);
}