package Programmers;
class 문자열다루기기본 {
public static void main(String[] args) {
String s = "abcd";
String s1 = "12345";
System.out.println(solution(s1));
}
public static boolean solution(String s) {
boolean answer = true;
if(s.length() == 4 || s.length() ==6) {
if (s.chars()
.allMatch(ch -> Character.isDigit(ch))) {
return answer;
}
}
return false;
}
}