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import java.util.*; public class Main { public static void main(String[] args) { // TODO code application logic here Scanner shuru = new Scanner(System.in); String shen = shuru.nextLine(); shen = shen.replaceAll("[^a-zA-Z]", ""); char[] si = shen.toCharArray(); for (int i = 0; i < si.length; i++) { if ((int) si[i] >= 65 && (int) si[i] <= 90) { si[i] += 32; } else { if ((int) si[i] >= 97 && (int) si[i] <= 122) { si[i] -= 32; } else { ; } } } for (int i = 0; i < si.length; i++) { System.out.print(si[i]); } } }