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import java.lang.*;
import java.util.*;
class Palindrome {
public static boolean isPalindrome(String s) {
s = s.toLowerCase();
char[] nonAlpha = s.toCharArray();
ArrayList<Character> alpha = new ArrayList<Character>();
for (char c : nonAlpha) {
if (Character.isLetter(c))
alpha.add(c);
}
int i = 0;
int j = alpha.size() - 1;
while (i < j) {
if (alpha.get(i) != alpha.get(j))
return false;
i++;
j--;
}
return true;
}
public static void main(String[] args) {
String s = "A man, a plan, a canal: Panama";
System.out.println(isPalindrome(s));
}
}
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