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

#define rd_skip() while(*rp++>=48)
#define rd() ({long _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define WTHI(v) ({ulong _z=v,_n=0,_d=0;while(++_n,_d=_d<<8|0x30|_z%10,_z/=10);*(ulong*)wp=_d;wp+=_n;})
#define WTLO(v) ({ulong _z=v,_n=8,_d=0;while(_d=_d<<8|0x30|_z%10,_z/=10,--_n);*(ulong*)wp=_d;wp+=8;})
#define wt(v) WTHI(v/100000000)
#define rep(v,e) for(long v=0;v<e;++v)

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

unsigned wd[10000];
char wdlz[10000];

void mkwd(){
	unsigned v='0000';
	long i=0;
	rep(a,10){
		rep(b,10){
			rep(c,10){
				rep(d,10){
					wd[i++]=v;
					v+=1<<24;
				}
				v+=(1<<16)-(10<<24);
			}
			v+=(1<<8)-(10<<16);
		}
		v+=(1<<0)-(10<<8);
	}
	rep(j,1000) wdlz[j]=1;
	rep(j,100) wdlz[j]=2;
	rep(j,10) wdlz[j]=3;
}

#define FWSIZE (1<<18)
int fw[FWSIZE];

static inline
void fw_add(long a,int v){
	while(fw[a]+=v,a)a-=a&-a;
}

static inline
int fw_get(long a){
	int z=0;
	while(z+=fw[a],a+=a&-a,a<FWSIZE);
	return z;
}

void fw_build(){
	for(long a=FWSIZE;--a;){
		fw[a&a-1]+=fw[a];
	}
}

char s[200004];

int main(){
	mkwd();
	char*mmap();
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	{
		long n=rd();
		rd_skip();
		s[0]=1;
		long d=1;
		rep(i,n){
			d=d<<1|(s[i+1]=*rp++&1);
			if((d&3)==1){
				fw[i]=1;
			}
		}
		rp+=1;
		fw_build();
	}
	char*wp=wbuf;
	while(*rp){
		long t=*rp;
		rp+=2;
		if(t=='1'){
			long i=rd();
			if(s[i]){
				s[i]=0;
				if(!s[i-1]){
					fw_add(i-1,-1);
				}
				if(s[i+1]){
					fw_add(i,1);
				}
			}
			else{
				s[i]=1;
				if(!s[i-1]){
					fw_add(i-1,1);
				}
				if(s[i+1]){
					fw_add(i,-1);
				}
			}
		}
		else{
			long l=rd();
			long r=rd();
			ulong z=fw_get(l)-fw_get(r);
			if(z>=10000){
				ulong b=wd[z/10000]|(ulong)wd[z%10000]<<32;
				long n=wdlz[z/10000];
				*(ulong*)wp=b>>(n<<3);
				wp+=8-n;
			}
			else{
				unsigned b=wd[z];
				long n=wdlz[z];
				*(unsigned*)wp=b>>(n<<3);
				wp+=4-n;
			}
			*wp++='\n';
		}
	}
	write(1,wbuf,wp-wbuf);
	_exit(0);
}