#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 rep(v,e) for(long v=0;v<e;++v)

typedef unsigned long ulong;

ulong b2;
ulong b1[64];
ulong b0[64*64];
char wbuf[1<<25];

int main(){
	char*wp=wbuf;
	char*mmap();
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	long n=rd();
	rd_skip();
	rep(x,n){
		ulong y=rd();
		if(y!=1){
			b0[x>>6]|=1ul<<x;
			b1[x>>12]|=1ul<<(x>>6);
			b2|=1ul<<(x>>12);
		}
	}
	while(*rp){
		ulong t=*rp; rp+=2;
		ulong x=rd();
		ulong y=rd();
		if(t&1){
			--x;
			if(y!=1){
				b0[x>>6]|=1ul<<x;
				b1[x>>12]|=1ul<<(x>>6);
				b2|=1ul<<(x>>12);
			}else{
				if(!(b0[x>>6]&=~(1ul<<x))){
					if(!(b1[x>>12]&=~(1ul<<(x>>6)))){
						b2&=~(1ul<<(x>>12));
					}
				}
			}
		}else{
			--x;
			ulong z=x;
			{
				ulong a=b0[y>>6]&(1ul<<y)-1;
				if(a){
					ulong i=63-__builtin_clzl(a)|y>>6<<6;
					z=i;
					goto hogera;
				}
			}
			{
				ulong a=b1[y>>12]&(1ul<<(y>>6))-1;
				if(a){
					ulong j=63-__builtin_clzl(a)|y>>12<<6;
					ulong i=63-__builtin_clzl(b0[j])|j<<6;
					z=i;
					goto hogera;
				}
			}
			{
				ulong a=b2&(1ul<<(y>>12))-1;
				if(a){
					ulong k=63-__builtin_clzl(a);
					ulong j=63-__builtin_clzl(b1[k])|k<<6;
					ulong i=63-__builtin_clzl(b0[j])|j<<6;
					z=i;
					goto hogera;
				}
			}
			hogera:;
			if(z<x){
				z=x;
			}
			*wp++=y-z&1?'F':'S';
			*wp++='\n';
		}
	}
	write(1,wbuf,wp-wbuf);
	_exit(0);
}