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

#define rd_skip_line() while(*rp++!=10)

char wbuf[1<<25];

int main(){
	char*mmap();
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	rd_skip_line();
	char*wp=wbuf;
	while(*rp){
		char*sx=rp; rd_skip_line();
		char*sy=rp; rd_skip_line();
		char*px=sx;
		char*py=sy;
		long z='X';
		while(1){
			if(*px==10){
				if(*py==10){
					break;
				}
				z='X';
				px=sy;
			}
			if(*py==10){
				z='Y';
				py=sx;
			}
			if(*px>*py){
				z='X';
				break;
			}
			if(*px<*py){
				z='Y';
				break;
			}
			++px;
			++py;
		}
		*wp++=z;
		*wp++='\n';
	}
	write(1,wbuf,wp-wbuf);
	_exit(0);
}