검색하려고 하는 y문자열은 받아들이고, x는 x[40] = "His teaching method is very good.";
자료 -> His teaching method is very good. 찾을 문자열 -> method (입력된 문자열) first found -> 13 자료 -> His teaching method is very good. 찾을 문자열 -> Hello Not found!