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

#define rd_skip() while(*rp++>=48)

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

#define HASH_BITS 21
#define HASH_MASK ((1<<HASH_BITS)-1)
ulong hash[1<<HASH_BITS];

int main(){
	char*mmap();
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	rd_skip();
	char*wp=wbuf;
	while(*rp){
		ulong h=0;
		long c;
		while(c=*rp++,c!=10){
			h=h*27+c;
		}
		ulong aa=~0;
		{
			ulong a=h&HASH_MASK;
			while(1){
				if(hash[a]==h){
					goto yes;
				}
				if(hash[a]==0){
					aa=a;
					break;
				}
				a=a+1&HASH_MASK;
			}
		}
		char*p=rp-1;
		long b=*--p;
		ulong m=26;
		while(c=*--p,c!=10){
			ulong h2=h+(b-c)*m;
			ulong a=h2&HASH_MASK;
			while(1){
				if(hash[a]==h2){
					goto yes;
				}
				if(hash[a]==0){
					break;
				}
				a=a+1&HASH_MASK;
			}
			m*=27;
			b=c;
		}
		if(1){
			*(int*)wp='\noN';
			wp+=3;
		}
		if(0){
			yes:;
			*(int*)wp='\nseY';
			wp+=4;
		}
		if(~aa){
			hash[aa]=h;
		}
	}
	write(1,wbuf,wp-wbuf);
	_exit(0);
}