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  1. public class Main {
  2. public static void main(final String[] args){
  3. final String sentence = "hello world! 722";
  4. final String result = sentence.replaceAll("[a-zA-Z]","@");
  5. System.out.println(result);
  6. }
  7. }
Success #stdin #stdout 0.07s 33640KB
stdin
Standard input is empty
stdout
@@@@@ @@@@@! 722